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Comments: I really like this string. They lasted a full 2 months (approx. 40 sets) before breaking. They have a soft
feel and excellent playability. My groundstrokes and serve performed well with these strings. My tennis elbow pain decreased after
playing with these strings. I slightly preferred Wilson Sensation 17 over these strings. If the Wilson Sensation strings discontinue,
or if my opinion changes, these will be a good string to change to. Enduring ongoing Tennis Elbow about a year ago began my
quest to find a new string. I was looking for comfort, playability, good feel, durability, and affordability. I feel a review like this
would have been very helpful to me, so I decided to post my findings so perhaps I could help others find their string. I string my
own racquets at 59 lbs. All the strings I evaluated were 17 gauge. I play 4-6 hours per week at a 4.5 level. Due to price and
durability, my overall #1 choice is Wilson Sensation.
From: Darryl, 2/14
Comments: I have been using IsoSpeed Multi strings for the last year and this string is the best so far. Soft, arm-
friendly with nice feel. Not sure about durability yet. I will update later.
From: Todd, 11/13
Comments: I am looking for a new cross string because Solinco has discontinued their Revolution and Tru Feel
hybrid. Went with this string because of the arm-friendly reference. Paired with Signum Pro Firestorm in the mains and the
playability was really good, but after a couple of hours the ISOSPEED string has already started to fray and doesn't look like they
have long left. A really good option if you have good racquet head speed and are looking for a comfortable partner for a poly
main, but maybe not the best if you pay for your own re-strings!
From: Charlie, 10/13
Comments: This string really plays like natural gut when it is fresh. It is really soft and spin freandly with superb
power and control. However, when I use again after resting for a few days, it feels dead and stiff.
From: Michael, 9/12
Comments: I was curious about this string because it was labeled "plus arm protection", which after shoulder and
elbow surgery, I really needed a soft string. And to think I almost didn't try it because of all the negative reviews, but after the first
hit, I couldn't believe how soft
it felt. I am a 5.0 baseliner that plays with a lot of topspin and touch, but the strings didn't move, so I was a bit confused why this
was a common complaint with all the other reviewers. It may be because I used the 17 gauge in a 93 frame with an 18X20 pattern.
In conclusion, I will continue to use this string because it plays extremely well, and it is very easy on the arm.
From: Robert A, 1/12
Comments: I never played well when hitting with this ISOSPEED string. However, this one is better than the rest of
the ISOSPEED strings. It is nothing special, it was moving from the first stroke in my Wilson K Pro Staff 88. I will never buy
ISOPSPEED. It is not as soft as Wilson NXT or Tecnifibre X-One Biphase. It is not as crisp or as spin friendly as a co-poly but it is
From: Jan, 8/11
Comments: One of my customers will use nothing but this string. He is a strong 3.5 senior man who uses very little
spin. This string is used in the crosses with a more durable string used in the mains. Mains are strung at 52 with the iso speed
crosses being strung at 62. It gives him good "pop and feel," his words.
From: Bruce, Abilene, Texas, USA. 07/10
Comments: I've been experimenting with Isospeed for over a year now, trying all their synthetics and even the
pyramid poly. I'm currently hitting with a Volkl Tour 10 Midplus (Gen I) with a full, very hard and flat stroke. Being a 4.5 baseline
basher, I win most of my points
with winners or (paradoxically) drop shots. Most of the time, my main concern is keeping the ball in the court (think of Gael
Monfils's 120 mph forehand, but with less spin)... As a result, I place a premium on ball placement, a relatively low level of power,
and feel. My wrist injury also demands comfort, and these polyolefin strings are the king of comfort. The Professional (strung at
60#) excels in all these areas, but only for a week or two. Compared to the Classic version, I feel that it loses tension, and thus
becomes a trampoline, much more quickly. Durability has been good so far, but since I have little spin, I'm not a string breaker
anyway. I would recommend this
string to people who are looking for a very arm-friendly, powerful option.
From: Robert, Hayward, CA, USA 10/09
Comments: I will never buy this string again. It only lasted less than 9 hours. Although it is very comfortable and
plays well, it doesn't last very long. This string hardly moves and does not develop any notches before it breaks. The breakage
starts from the outside where the strings hit the ball, not where the strings rub against each other. The first 3 hours of play I
notice the outer layer peeling off. Another 3 hours and the filaments started showing up.
From: Anon. 9/09
Comments: Considering using Isospeed Pro as a cross with natural gut, I decided to try a
full job first. Strung it at 52 in a 90. These comments based on this one job... Disappointed straight away by excessive string
movement, which was little better than a syngut, despite USRSA rating it 3.5 (well above average) in 'resistance to movement'. Low
tension had something to do with this, but... Felt nice, soft and crisp at the same time, if that makes sense. Even at low tension it
was low-powered and controllable. But after about 6 hours the outer layer of polypropylene began to fray badly on two crosses.
15 minutes later and that layer looked like it had exploded, with fluffy-looking white hairs puffing out to reveal that the
polypropylene layer had ripped in half on those two crosses, revealing a very thin strand of syngut (nylon) in
the core. The polypropylene layer then shrank back away from the rupture site as the string lost tension very fast. Surprisingly,
the little syngut strands didn't break, but the frame was unplayable at that point, having lost at least 20 pounds of tension on
I don't think this makes a suitable cross string for a hybrid, and will not use it with gut mains. Most strings break in the mains,
not the crosses. That this string broke in the cross tells me the outer polypropylene layer isn't up to the job, getting wrecked by
the sliding friction of the mains. One of the virtues of the 'Fed setup' is that the gut mains slide freely on the poly crosses - not
the case with Isospeed Pro crosses. May as well cross with syngut if you're looking at the Mojo setup, in my opinion. Unless, as
some have claimed, Isospeed Pro Classic does a better job in this capacity. But I think a soft poly is
probably more suitable.
From: anon. 07/09
Comments: Although I like the feel of this string and the way it plays, it is much softer and wears quicker than the
Isospeed Professional Original. If I had to choose between the two, I would stay with the original.
From: Chris, Tacoma, WA, USA, 06/09
Comments: This is the worst string that ever I met! No power, no feel, no comfort, and no spin. Please don't buy
From: Daniel, Irvine, CA. 04/09
Comments: Great string with nice feel and power. There is some confusion whether to string this higher or lower
than typical, but IsoSpeed recommends that it is strung 10% LOWER with this newer version of the string (higher with the "classic"
version). I am able to play about 15 hours or so on a set of strings before changing and the string is also extremely comfortable. I
have not had any arm/elbow pain since using IsoSpeed Professional like I did with softer polys. I have not found a string with a
better mix of control, feel and power. Great for serve & volley games especially.
From: Todd, Amherst, NY, USA. 6/08
Comments: Well, I first strung my Fischer M Comp with this string. I expected more
gut-like feel out of this string like Iso-Speed advertised; however, I did not get it. The string has tremendous control, but my
frame doesn't need it. It has enough control of its own. So, if you can bench press 400 pounds for reps, maybe you should get this
string. The ball hardly went over the net strung at 45 lbs. As far as feeling like natural gut, forget it. The only string that feels like
natural gut is natural gut. The best natural is Babolat.
From: Bear, Pennsylvania. 11/07
Comments: I have been using the original Iso-Speed Professional for about a year in the crosses of my Head
MicroGEL Radical (both the pro and regular) with Head Ultratour 17 (poly) in the mains strung relatively tightly. I have continued
with this combination and the feel is amazing. The string is ridiculously soft and has very little feedback down into your arm. With
the poly, it is very responsive to spin, but the best feature is just the pop off this racquet. Easy power with little feedback makes
this string a really good option for those with any arm and elbow problems. However, this just doesn't last. My most recent
restring lasted 3 days of a combination of coaching and hitting. It seems that part of what gives it the nice feel is the tight outer
layer. It doesn't groove like most strings, and it seems to reach a point where the outer layer just snaps. This leaves a thin fine
thread like layer in the middle that won't last more than a game. Again, this string has wonderful feel, and I would highly
recommend it to anyone looking for a soft feel with plenty of pop as long as you don't hit with a lot of topspin.
From: Talor, Wollongong, Australia. 11/07