Tecnifibre X-One Biphase 16 String Reel Customer feedback

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Comments: I tried X-One as an alternative to Wilson NXT. The Wilson string feels and hits great but after about two 2 hour sessions, the string would easily fray and eventually break shortly thereafter. In comparison, after three two-hour sessions of hitting with X-One, it has exhibited no signs of wear or fraying. It still hits great and, frankly, has a bit more pop than NXT, in my opinion. It might be a bit stiffer of a string, but I really enjoy this string and will be my go to choice from here on out.
From: Kin, 9/13

Comments: Strung this in two of my Head Speed Pros. To me it doesn't matter whether it is in the mains or crosses. If you hit the ball hard, with heavy top spin, they will break very quickly. Strings lasted me a little over two hours. Both broke within the week. Very soft feel, but expensive.
From: Carter, 5/13

Comments: This string is pretty good, but let's stop saying "gut-like." If you want "gut-like" you're going to have to pony up for the real thing. While it is very good for a multi, it does not provide anywhere near the feel that gut does. I do like it for what it is, and I may continue to use it because it is a bunch cheaper than VS, but I'll have to settle for what it can deliver.
From: Walter, 5/13

Comments: I really like this string. It has a gut-like feel and the playability of this string is so incredibly amazing. I used it for a hybrid setup with Luxilon ALU Power in the mains and Technifibre X-One Biphase in the crosses at 57/56 lbs -- works excellent in feel and durability.
From: Doodz, 4/13

Comments: The string does not provide power, and usually string will last me a good month, but this popped within a week. I have played with hybrids from all kinds, going from Luxilon to Gosen and everything between. It just has no feeling or power, so it becomes null. My stick is a Dunlop Aerogel 200 strung at 60lbs. I'm going to try Tecnifibre's poly, since I read good reviews of it, but if I don't like it I'll go back to Luxilon. I'm a 4.0 player.
From: Marcos, 9/12

Comments: I'm 1st singles on my high school team and for the 3 years I've been playing I've always used polyester strings to maximize my spin. After switching my racquet from the Babolat Pure Drive to the Wilson Pro Staff Six.One 90 (a significantly lower powered frame compared to the Pure Drive) for more control, I needed a more power-oriented string to balance this. After seeing many good reviews on this, I gave it a try and was very impressed. I could get the power I wanted and needed for a modern game (I'm a 4.5 player) while still getting great spin and control. Agreeing with many of the other commenters, if you are a player who hits a lot of spin and power on nearly all shots like myself, these strings will get you about 4-6 hours of play before breaking. For a 50 year old woman these might last a while, but not for 17 year old guys that like to take the fuzz off the ball. Maybe I'll try a monofilament in the mains for more durability.
From: Joe, 8/12

Comments: I did extensive research on which synthetic gut to use in my hybrid mix that would work best for me and my game. This is the one. I have used this for over 3 years now and I love it. I use Lux Rough on the mains at 56lbs and Tec Bi Phase on the crosses at 58lbs. I play at the 4.5 -open level and I am a serve and vollier and can play baseline as well. This string gives me the feel I need to play my all-around aggressive game. It does, however, only last about 4-6 sets of singles so I rotate 3 racquets. I ususlly restring when it is frayed just before breaking.
From: Dave, 7/12

Comments: One of the most comfortable strings I've ever played. Power shots, cut shots, slice shots all jumped off the strings. Unfortunately, they only did so for about 5 hours of play. Noticeable fraying after only a couple hours hitting, popped after 5-6. It's just not in my budget to be restringing once a week. It's a shame, because the strings played magnificent.
From: Jason, 5/12

Comments: I have got to say this is very good string. I have it on my K factor at 58 pounds. It has great feel, but the downside is its durability.
From: Samuel C, 3/12

Comments: The best multifilament on the market. I agree that its durability is in question but the comfort, power, and spin is unmatched! I definitely recommends this string to any tennis player at any level.
From: Ken, 3/12

Comments: I've been using this string for close to 7 years now and I wouldn't use anything else. It's combination of power and fell is unrivaled and if you are an intermediate to aggressive player, adding these strings to your frame is the easiest way to take your game to the next level. I would not recommend this product if you are someone who does not like to break stings, as the overall durability isn't the greatest. One set of strings will usually last 8 to 10 hours of heavy hitting before giving in, but in that time there is almost no noticeable loss of playability.
From: Steven, 2/12

Comments: I strung this on my wilson BLX90 in the mains with luxilon ALU power rough in the crosses. The durability of this string was better than I expected, lasting 3 months, being used 3-4 times a week and not loosing much tension. However, I did notice the feel of the string become more "dead" after about 2 months of play and the luxilon cutting into the X1 and then, just yesterday, it broke. Also there was slight fraying as I have a medium amount of top spin on my shots. But overall a nice, comfortable string. Tip: If crossing with a tough poly, try using string savers.
From: Matt, 1/12

Comments: This string has great feel and pop, and doesn't slide around. My favorite string yet.
From: Anon, 12/11

Comments: I used these strings in the mains with Signum Pro Plasma HEXtreme in the crosses. I broke two mains within one and a half hours. Otherwise, the string was nice and soft on the arm. Stringing it was nice and easy, as it was quite a flexible string. My only complaints are that I feel that it was a bit mushy and I lost the ball in the stringbed a little. Great string, but I wish that it was a bit more durable.
From: Alex, 12/11

Comments: Response to Steve, 8/11, below and others experiencing short string life, Steve mentioned the problem with the crosses wearing prematurely, I experienced the same problem. The solution is to reduce the tensions of the crosses to the mains. Not easy and you will need several trials, but if you stick with the mains at a set tension, reduce the crosses until you no longer see the wear or at least see equal wear on both. For me, it was 62 mains, 58 crosses. Every racquet head is geometrically different, so it will be trial and error for different rackets and users with different tensions.
From: Tony, 10/11

Comments: I tried this string in a Wilson K Blade Tour after being a loyal Wilson NXT user. I prefer this string to NXT and I really liked the NXT. This string is very arm friendly like NXT but has a little more punch or feels a little more crisp. The string surface allows for some nice spin as well. I'm sold on this stuff!
From: David. 08/11

Comments: We kept X-One in the mains and put a "Poly" in the crosses and that works great! The mains still look new after a week of hitting. For some reason this string not durable in crosses.
From: Steve, 8/11

Comments: The X-One felt good, but the crosses shredded in a couple of days! I'm going to try these in the mains and go with a poly (prince Beast) in the crosses hoping that will help.
From: Steve. 7/11

Comments: I'm currently using NRG2 16 in the mains @ 48 on Donnay X-Blue 99. Crosses are Genesis Black Magic 16. It's the best string combo that I have used in the Donnay's. The NRG2 plays awful close to gut. It's not as powerful as gut, but more cost-effective. It plays better with a poly in the crosses than a cheap syn.
From: JT, Nashville, TN, USA. 06/11

Comments: They have tremendous feel and comfort. I have them in a hybrid, with Luxilon Alu Power Rough in the crosses. The best bang for your buck for a multifilament that is comparable to natural gut. I'm not sure about durability yet as I've only played the strings for a little over 4 hours, but so far I'm extremely impressed and will likely buy again. Tecnifibre's premiere strings.
From: Brian. 6/11

Comments: Strung in crosses with black code in the mains. Played very well, but biphase broke after six hours of play.
From: Anon. 5/11

Comments: This is one of the best multifilaments out there! I am a high school player playing with a Prince 03 Speedport Black. I had this string strung at 56lbs. After a quick break-in I was able to hit with some great spin and power. I always felt like the string had good control as well. I would recommend this to any player looking for a great multifilament string that offers great spin and power.
From: Jason, Chicago, IL, USA. 4/11

Comments: I LOVED my Wilson K-Gut, but for some reason, it is no longer available anywhere?!? I tried this and did not like the results. It felt as if I was playing with a pillow wrapped around my racquet...UHG! NO FEEL! I'll keep looking....
From: Jane, Wheaton, IL, USA, 02/11

Comments: My requirements in seeking out a string were that I wanted a combination of:
1. Comfort 2. Power 3. Spin 4. Control 5. Durability
I looked at sites that had reviews on 100's of strings and based on my criterion, this was the BEST choice. Other strings don't play as well, arm stiffness etc. These string are excellent and they hold tension well.
I have a mid-size and I string one at 55 and the other at 53. And there is a noticeable difference in control when I use the 55lbs (though it still has power and spin). The 53 gives a lil more pop on the serve. Regardless....I love this string!
From: Jorge, Virginia Beach, VA, USA, 01/11

Comments: I was wrong about arm friendliness of this string. It is really good. It starts stiff but then after 2 hrs of hitting it feels much much better. So I wouldn't advise lowering string tension but get used to it. Durability is also pretty good. Really a nice alternative to natural gut and it's got tons of pop. I have switched to 17-gauge version of this string, which I think one of the best multifilaments I've ever played so far (trust me I have tried many many strings). See my review in 17-gauge. Thanks!
From: Bharath, Hillsborough, NJ, USA, 01/11

Comments: Let's get serious. This is the best bang for the buck for a hybrid set-up. It pains me to reveal this info, but string it in the mains with PSG Duraflex in the crosses at the tension of your choosing. Reap the rewards.
From: Jay, Ardmore, Pa, USA, 10/10

Comments: It's really similar to natural gut. If you like gut and want it with a lower price, this is your choice. Please use this string and save the cows. :)
From: Jack, Denver, CO, USA. 09/10

Comments: Excellent string overall with this gauge EXCEPT one thing: poor tension maintenance.
From: John, Portland, OR. 6/10

Comments: I re-strung my racquet for the first time. I rate my self as 2.5-3.0. The stringer strung 2 lbs above the range for max control and less long-balls (which was my biggest problem). I did not like these strings at first, but after hitting for about an hour, I absolutely loved these strings. No more long-balls. I was able to hit my shots with a lot of pace and a lot of top spin for the first time! My hitting partner(rated 4.0) said he noticed a HUGE improvement in the placement and power of my shots. Also, no soreness in the elbow after a 2 hr session! I didn't notice any movement of the strings either. Now...let's see how long these strings can last.
From: XANKX, Los Angeles, CA, USA. 06/10

Comments: I figured all the great comments about this string pretty much had this one covered but following the unofficial TW rule of you hit it you review it, I figure I better contribute. This string is AWESOME!!! Love the feel and power of this string but most all the comfort is what really blew me away. I have had some injuries from other sports that made it hard to hit for long periods of time without severe pain in my wrist and hand. Since I've been using this string that problem has almost completely gone away. Also I'm somewhat new to tennis and I didn't really understand the term "BALL POCKETING" until I started using this string. Yes it does fray like a multi and yes I'm sure there are great strings to hybrid this with to increase overall durability, but if you are looking for maximum comfort then this is your string.
From: Dallas ...that's my name not where I live., Petaluma, California, USA. 6/10

Comments: In my personal opinion, this is the closest synthetic string to natural gut. Power and spin are awesome, and response is very clean.
From: Occhy-Yedjad, 05/10

Comments: I have tested many strings including VS Team. This string is definitely not comparable to VS Team on the "feel" factor side but overall not a bad string. Excellent durability, tension maintenance, ball pocketing, spin and control. But not arm friendly. Mainly due to the fact that you have to string at a much lower tension then usual. I'd say 5 lbs lower for sure. I usually string mine around 55lbs so went with the same number for this one as well. But it felt around 60-62 and definitely not a good feel. So a definite disappointment in that category. I'm switching to 17 gauge version and will string at 50 lbs. I'll post a separate review on 17 gauge string later.
From: Bharath, Hillsborough, NJ, USA. 5/10

Comments: In my humble opinion the best multifilament string out there right now. Still, if you're not a string breaker I would still go for Babolat Tonic+ or VS Team/Touch natural gut. Just like all multis, the Biphase loses tension fast, whereas the natural gut holds tension like no other string.
From: Jon, Genk, Belgium. 4/10

Comments: Great string! Using it on my LM Instinct @ 50lbs. It feels very comfortable on my arm which was the main reason I bought it. It gives me more power, spin and playability is fantastic. I think I'm going to stick to this one for a while. I highly recommend this string for people with tennis elbow.
From: Cristian, Sebastopol, CA, USA. 4/10

Comments: I thought it was a little too stiff and underpowered compared to NXT. It made the sweet spot feel to small on my 18x20 string pattern Head Prestige mp racquet. Just didn't feel right to me. It's also a little pricey considering you can get gut for a bit more. Try KLIP Legend if you're willing to pay a few bucks more.
From: nate s, kettering, oh. 4/10

Comments: t took me some time to get used to it, but that could have to do with the fact my stringer strung me at a higher tension than my usual by mistake... but once I got used to it I was very impressed... great control... I was used to Babolat Hurricane and the likes before that so this was really an improvement in control. I just wish it would last longer for the price. Not sure if I will go back to it, but I recommend a test play with it!
From: Marc, Ottawa, ON, Canada. 2/10

Comments: This is the best string I've ever used, it does every thing well from hitting the slice to hitting the kick serve. It hits great topspin, which is needed for a modern game. Great string to come in and sneak in a serve in volley every once in a while. The only things I didn't like about it was it isn't very durable and moves frequently. I would give it a 9.75/10
From: Kyle, Birmingham, Alabama, U.S. 01/10

Comments: The string is Ok, but is underpowered compared to the string I've used in the past. It does have good feel and is soft, and it literally feels that you are throwing the ball across the net. Personally, I like strings with a lot of pop, so I don't think I will be using this again.
From: Wilson, New York, NY, USA, 09/09

Comments: I put this in a friends racket because he wanted to try something besides gut in the mains and it broke clean in two places at once! I felt bad because I recommended it and probably will not buy it again, maybe it was a faulty pack or something but it isn't cheap stuff, only compared to gut these days!
From: Rizza, Longview, WA USA 09/09

Comments: I don't like this string, because it breaks very fast. However, the playability is good, but it doesn't worth to restring every 2 days.
From: Tomi, Budapest, Hungary 08/09

Comments: A good choice for someone needing a low powered, very soft string. I strung it at 59 lbs and didn't get too much power, but a nice plush response that allowed me to swing out with confidence. Good choice if you don't want to go poly.
From: Anon. 8/09

Comments: Does not last long at all. I am tournament level junior player and I broke 3 sets of this in a week. I was using this as the cross in my hybrid string blend. I would not buy again. Can't restring every couple days.
From: anon. 08/09

Comments: A nice gut-feeling string without the price tag, but I wouldn't use this as a full, hybrid it with a softer string and you have yourself a great string bed.
From: Junior, G-burg, MD, USA, 07/09

Comments: I had this strung in the full bed at 58lbs. The mains were fine but the crosses were absolutely shredded in like 6 days. I was surprised with the durability, it lasted me 2 weeks of playing -- 2 hours a day. It's a good string, but I would not buy it again.
From: Brad, MA, USA. 05/09

Comments: Strung X1 16g at 62 lbs mains with synthetic crosses, tension loss after about 4+ hours, main strings moved a lot after playing with a lot of spin. Previously tried X1 in 17g, tension held better than 16g, less string movement, but too much power. Probably 16g better suited for stringing as crosses.
From: James, Walnut Creek, CA. 04/09

Comments: These strings are not right for me at all. Maybe it needs a break in period, but after hours of hitting I don't like this string. I didn't notice any added power or control. Very disappointing for the price. I'll re-post my comments if it feels better after the first 3 hours.
From: Bryan, San Jose, CA, 4.0. 2/09

Comments: I used this string on my Head Radical Microgel mp strung at 58, and I broke the string within 8 hours time, but... great feel and power. All round I'd rather stick to the Signum pro HEXtreme (orange).
From: Lionel,Australia, Vic, Mel. 2/09

Comments: Bad choice for me. I strung this at 62 lbs. on my Pro Kennex Kinetic 7.0. A lot of the reviews have commented on the power of this string, but I found I had to exert great effort to hit the ball consistently past the service line. In short, not nearly the power I expected. I'll end up switching back to either NXT or Gamma synthetic.
From: Chris, Pasadena, CA, USA. 1/09

Comments: The X-One Biphase 16's are excellent if you are a player with heavy topspin. Strung at 54 as crosses with Luxilon Big Banger as the mains, the strings lasted about three days with an average of three hours of hitting per day. The mains were broken in and lively but the Biphase's started to wear as if the too much topspin had thinned it down and the sweet spot literally looked like it was made of cloth. The only problem is the durability, other than that, no complaints.
From: Hoang, Piscataway, NJ, USA. 1/09

Comments: X-one Biphase is a very comfortable string that gives you great power and feel. It's very much like gut as the racket feels like an extension of your arm. Polys generate great spin and last long, but feel uncomfortable. This string gives you a little extra power without the jarring shock of poly. X-one Biphase works well with a closed patterned racket like Head radical. Polys are good if you want a lot of shocking spin and want to save money with it's durability. But if you like power and feel, go with the multifilaments like X-one biphase.
From: Jim, Milpitas CA, US. 11/08

Comments: Very good strings I'm using the 16 gauge. I used to use the big bangers, which is still the best in my opinion. But these to me are good. Very different from bangers. It is easy on the arms and has a good feel. Although I like my strings to have more of a feel to my nblade so that's the only reason why I would go back to those. But don't get me wrong, these are good and I will definitely buy these again, just not now.
From: Dream, CA, USA, 10/08

Comments: I'm using these strings on a LM Radical @ 59 lbs. I came from using Prince Original Synth. Gut @ 60lbs. The strings come in a nice matte black finished package. You could tell the difference in quality from Prince vs. these. Immediately, I felt more bite on a ball, more forgiveness on off-tossed serves and absolute comfort and no arm pains. This string is the one for me! I was surprised to see how much different hitting with a more expensive string could do for your game. My philosophy used to focus on form determining your quality of strokes. But I now know there's only so much form can do before you take a step and upgrade your equipment. To compare and contrast, you can drive well in a Honda Accord. But when you take a drive in a 400 hp Lexus ISF, you notice that your whole driving experience opens up. In this case, changing my strings to X-One Biphase, my serves had more spin, more speed, more pop. My groundstrokes land deeper and I can see more prominent differences in hitting flat versus spin. Amazing string.
From: Robert, Los Angeles, CA, US. 9/08

Comments: This string is closest to gut like performance for a lot less money. The playability is awesome as there is plenty of pop and ball bite. In addition, this string is very easy on the arm. I'm currently using the 16 gauge version in my Volkl C10 and plan to continue doing so. Tecnifibre continues to make one of the best synthetic strings in the world! Kudos to Tecnifibre!
From: Ken, Brooklyn, NY, USA, 09/08

Comments: Love it. Very easy to string, gut-like performance, very solid contact. Just switched over from Luxilon BB ALU Rough. The string destroyed my arm, so I looked for a different string and found this one. Very soft on the arm and the durability isn't bad at all. A little fraying after 10 days of play (3-5 hours a day). Overall, I love this string and the potential is limitless. If you choose to buy the string, try and notch it toward the higher tension range.
From: Cooper, Syracuse, NY, USA. 8/08

Comments: Great string overall. I strung it on my Head Microgel extreme pro at 61 lbs and after a week, I still don't see any signs of wear. I found that the strings also provide exceptional spin and a feel comparable to natural gut.
From: Brian, Centreville, VA, USA, 08/08

Comments: Personally I find this string to be great especially considering it's 16g. I found above average spin and a wonderful pop off of them, and after almost a month, there's barely any signs of wear or drop in tension. When I'm going to restring my racket I will try it in 17g and compare, but so far it's my favorite string to date.
From: Chris, marengo, IL, USA. 8/08

Comments: Great string with the Head Microgel Radical. Gives the right spin with the power. Also has ok touch. So buy for Head Radical.
From: Justin, USA. 8/08

Comments: So far I'm really disappointed with these strings. After all the hype and good things I've heard they just didn't work. I did not get much spin which combined with the loads of power equaled many unforced errors and they added a ton of weight to my stick (12.1oz-12.6oz a full half oz). On the positive side the extra power helped me bang in some heaters while serving and I have never tried a more comfortable string in my life (not even natural gut). Overall it is a great string just not the one for me. I normally use prince lightning xx 17g so I may pick up a set of these in 17g and see how I like those.
From: Daniel, Mililani, HI, USA, 06/08

Comments: These took me a day or two to break in. I don't hit hard normally, but my friends do. Once they break in, they feel good. This string is more powerful compared to the NRG2. More crisp impact, but I liked the feeling of my NRG2s more. Probably just me. But if you want more power, these strings are for you.
From: Li, NJ. 6/08

Comments: I strung two racquets with this strings as crosses (poly mains). The first one at 57, second one at 60 and I could not control the power of this stuff. The balls were flying all over; don't like it at all! These are very bad strings, too much power, trampoline effect, no feel, what else? Keep away of these, don't throw your money away
From: Blackfrido, USA, 04/08

Comments: These are very bad strings. I had these strings for 3 weeks and they shredded for no reason. I am not happy with this. They should have lasted way longer than that. I hope that you fix the problem before it happens to anyone else; the durability is not good.
From: Shaun, Riverside, CA, USA. 3/08

Comments: This is an excellent multifilament. I have also used Tecnifibre's NRG2. I tried both on my Wilson nSix- One 95s, both strung at 63 pounds. I'm not sure which one I would prefer, though, as both are excellent strings. Both also had surprising durability for multifilaments. I think the X-One Biphase gave a little more spin. So if I had to choose one, I think I would go with the X-One Biphase. But I would recommend trying both and see which one you like better. I don't think you can go wrong though with either.
From: Atul, New York, NY. 3/08

Comments: I think I agree with Thomas below. Too much power. I dialed up the tension as much as I could and still needed to dial back my groundstrokes. I lost a bit of control and feel on the slice and volleys. Maybe with extra tweaking I could find the right balance, but the Wilson NXT and Tecnifibre NRG2 suit me the best. My humble opinion - if you ever want an all- around game, stay clear of this string. If you like to simply bash from the baseline, want some extra juice, and are OK with leaving the touch and feel shots in the quiver, this string is an option to consider. Otherwise, those precision shots may suffer because the balls do explode off the stringbed.
From: Joe, San Diego, CA, USA. 3/08

Comments: A good string overall. I liked how it was nice in my hybrid with Luxilon Power Spin 16. This combo offered very good topspin and power. Everything was exceptional except for my volleys, which were a little overpowered, but nothing a little practice won't cure. Overall, this is a great string for the three hours I played with it. It is threading already just like gut, but not as bad. Gut broke way too fast -- only 5 hours -- which was ludicrous considering I spent 30 bucks on it. This will last another 10 hours judging by its current condition.
From: Anon. 1/08

Comments: I was using Babolat Pro Hurricane Tour, but it was killing my elbow. Now this stuff is incredible! Freshly strung, it's very powerful, but pockets the ball so well that control is perfect. It doesn't dampen vibration as well as I'd like, but of course a nice "US OPEN" dampener takes care of that. Highly recommended.
From: Alex, The Woodlands, TX, USA. 1/08

Comments: I use ALU Rough crosses and Babolat gut mains at 60#. More powerful than gut, and 1/4 of the durability. Going with poly crosses gives you a much stiffer, more control oriented stringbed than poly mains. I went through 4 sets of this string to just one of my gut. I play with a Flexpoint Prestige MP, so my strings last much longer than in other racquets. Because of that, price isn't an issue. I like the string just fine, but it is not a substitute for gut.
From: Roy, Santa Rosa, CA, USA, 08/07

Comments: Exceptional string. Very responsive, very good feeling, good spin and high precision. Average durability but very willing to have average durability for the other exceptional qualities.
From: Anon, Switzerland, 07/07

Comments: The string does have a nice feel to it but different. Way to much power and it just didn't produce the topspin control that NXT does. I'm going to stick to NXT. Pure Drive 60#
From: Thomas, Evansville, IN, USA, 06/07

Comments: This string in term of feel and durability are much better than Wilson NXT Tour 16 that I had before, it hold the ball longer, and better in control. I string at 59 pound on my Prince Tour Graphite Classic Original Mid.
From: Ken, Cypress, CA, USA. 6/07

Comments: Strung in a KSix-One Team at 55lbs. Way too powerful, too springy, too slick. It might be OK if you want to string at the maximum rec. tension. But I'm switching to something crisper (original sensation, which came in the racquet, is much crisper) with much better durability. At 14.50 a pack, don't expect a miracle: it's an elastic multi that will fray very quickly.
From: JD, Brownsville, Texas, USA, 06/07

Comments: For power and feel this is the best string out there - plays like gut. I've tried all the strings in the comment below, plus more. I've also tried a number of polys and hybrids. As far as control some of the polys may have the edge, but if you don't mind some power this string is the best out there.
From: Ryan, Redondo Beach, CA, USA, 06/07

Comments: This is the best string I have tried so far. I have gone through many multifilament strings, NXT, NXT Tour, Bab. Excel, K Gut, K Gut Pro and VS Gut and none of them hold tension as well or as comfortable as X-1 Biphase. This string holds up to all good comments mentioned in my opinion. KFactor Six-One 95 at 57lbs.
From: Brian, Laguna Niguel, CA, USA. 5/07

Comments: Looks like I am the only female. I tried NXT before and loved it a lot, so I loved multi's. And then I looked for a much better multi, and found biphase. I strung it at 56, pretty stupid. And I also had lead tape on my racquet. And my shots very going out, so I ripped off all the lead tape on my racquet and the power went down. And is the right power to me. This is a great string. My string started to fray so I invested in some string savers. And love this string a lot. A perfect mixture of Power, Control, Comfort, spin. Love this, and for sure use it again. Next time I will string it at 63.
From: Kathleen, NY, USA, 03/07

Comments: Yep, this is the string. Outstanding power and control. Feel is not quite as good as some of the Babolat strings, but all things considered (incl. durability), this is the best I've used. I've had it in my Babolat Aeropro for the last year. I agree with an earlier comment: string toward the high range for best control.
From: Brian, Mill Valley, CA, 03/07

Comments: Unbelievable, you cannot get a better string than this. I used gut before, but I love this string more than the gut and it's half the price of gut and it's as good as gut. I love this string more than NXT, and NRG2. I got excellent amount of power, perfect control, 100% comfort. I have tennis elbow, and after a session I felt no pain in my elbow. My backhands were much better; my serve is way better. I say this is the best string I tried in 10 years. And I am shocked I didn't come across this earlier. If you like NXT, and NRG2 and thought that they were awesome wait till you try this string, it will just blow you away. I was 200% happy about this string. In this review people were unhappy about was the durability, I solved that by investing in string savers, so the durability increased.
From: Andy, NJ, USA, 01/07

Comments: I have to say that this string blows all strings out of water. I have never hit with a string with more power, control, and feel. I mean the power and ball striking you get is incredible. On serves, the ball just explodes on kicks and flat serves. The strings don't move, so its kind of like big banger in that there is controlled spin. I have nrg2, which is outstanding, but this is a step above. This is worth the extra 2 bucks over nrg2.
From: Colin, Alaska 09/06

Comments: I strung Luxilon Big Banger Alu Power 16 on my Pure Drive Standard because I heard it was a good string. It was durable, but it was killing my arm. So, I decided to cut it off and put new string on. X One 16 is a really nice string. It gave me drastic improvement on my strokes and especially my serve because this string has a lot of power. Don't get me wrong; it doesn't make your racquet a springboard. I've played with this string for about a month, about 4 or 5 days a week, and the string is still good and still has power. The string started to move during the beginning of the 3rd week though. X One has excellent feel, power, and comfort, but it isn't good with slices and drop shots. While it is still possible to do a decent drop shot or slice, its thickness, most likely, makes it harder to do good slice and drop shots. Nonetheless, this is a very, very good string.
From: Jacque, Seattle, WA, USA 07/06

Comments: I usually string with gut because I have both wrist and shoulder problems. I decided to try Biphase because of all the great reviews and its arm-friendly nature. The previous post was right on - it takes about two to three hours to settle in and then plays fantastic. Not as much power as gut but just as much control, touch and comfort. I'm sold - this is my new string of choice. I use a Head Flexpoint Instinct strung at 60 lbs. and also get less vibration than gut with this string. You owe it to yourself to give this excellent string a try!
From: Joel, Studio City, CA USA

Comments: This string is fantastic!! I am a high school tennis player and I have tried many different strings in my tennis playing career. I have went from Wilson NXT, NXT Tour, Sensation, Reaction, Gamma Live Wire, TNT, TNT2, and many others. I have found that Tecnifibre X-One Biphase gives me the most spin potential and most pop off my forehand. The string takes a couple hours to get broken in, but after that it is sensational!!! I recommend this string to anyone that is looking for great spin and exceptional power. Strung on a Babolat Z-Tour at 60-62 lbs.
From: Mark, Cookeville, TN USA 03/06

Comments: I played with it for a little over a month. Durability was not as good as I wanted so I switched back to another string when it broke. My advice is if you don't want to get hooked don't try it. I hate the price but now I have to have it. I definitely noticed a drop off when I switched back to my old string. The feel is better than anything I have tied. You get rewarded when you hit thought the ball with solid strokes. You can feel the ball pocket and other than throwing the ball over I don't know how I can get more control out of a string...I mean a sting that has some pop. I started to place the ball deep in the corner with regularity. I beat a guy 6-7, 6-2 and 6-1 that I had never even taken a set off of before. The string did not make me instantly better but it gave me the confidence to go for more shots. The more I hit with it the more confidence I gained and the better I got. I hate that I like it because it is not cheap. But now I can't afford not to play with it. I play with a Prince Diablo Tour strung at 63 Lbs
From: Rondall, Clinton, MD, USA

Comments:I used to use Luxilon Big Banger and it was just killing my arm. I tried an arm friendly string Wilson Sensation and hated it. Then I tried the X-one Biphase and it was great. No arm pains and hitting with great pace. I had good topspin coming of the racquet. I felt I had good control and the string has decent durability. I would not say great durability. It is a powerful string. I would recommend the string. I am going to try the Tecnifibre NRG2 and compare. Strung on a Babolat Pure Power at 56lbs.
From: Dave USA 07/05

Comments: Amazing string. I would not have tried it because of the price tag but ordered a used racquet off the boards and it came strung with this. Amazing power and comfort. Great control and feel. I definitely recommend it. Once I become manager of my McDonalds I will definitely be ordering my own packs.
From: Mike, Milwaukee, WI Usa 07/05

Comments: I didn't want to like it, because of the price tag, but I was given some test string.... WOW, very comfortable and pretty powerful stuff! My opponents said it was the best I have ever played. It wasn't like my game only improved a little, It was dramatically better. Lots of pop, very similar to gut, pocketed well and my control was decent. No fraying in 3 hours. Gotta say, it is probably worth the money. I am used to buying 4 buck poly or synthetic... ooh this is gonna hurt, but it might be the secret ingredient to my plan for COMPLETE WORLD DOMINATION!
From: Hedley Biphase, Southside, VA, USA

Comments: What a great arm friendly string. I really didn't like it at first because I was into experimenting with expensive polyesters and wasn't used to the feel. After a few matches I felt the tension hold was really good and the durability a surprise because it lasted as long as some polyester's I have used. Most definitely worth the bling.
From: Eugene, NY, NY, USA. 02/05

Comments: The softest and most powerful string I ever tried. I use it for cross strings with monofilament mains.
From: David, former pro, USA. 02/05

Comments: Great string, exceptional feel and great power with just enough control. I love this stuff! (I'm an all-court 5.5 player who strung his Head i.Prestige MP XL at 62lbs.)
From: Damion, Los Angeles, CA, USA. 07/04

Comments: My favorite string from Tecnifibre. Although it is less lively than NRG2, it has good power (especially compared to NXT). It is very controllable, largely due to its notable ability to impart spin. Tension maintenance in this string is also better than Tecnifibre's previous offerings. I have gotten relatively good durability from this multifilament (aside from providing superb comfort, the polyurethane also seems to lessen string movement). However, string breakers on a budget might be weary of the price. Strung in a
From: Dunlop 200G XL @ 71lbs).
Dean, Appleton, WI, USA. 5/04

Comments: Plays similar to Tecnifibre NRG2, but is crisper and slightly less powerful. String bed doesn't get as mushy as NRG2 or NXT. The durability and tension maintenance is much better. Plays similar to Laser Fibre Phenom and Klip Excellerator.
From: Michael, Raleigh, NC, USA. 4/04

Comments: The softest and closest feel to natural gut. The durability is okay. Try it yourself.
From: Anon. 2/04

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