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Comments: After a few months of using these strings, I still keep the same opinion that the strings provide very good playability. Unfortunately the durability is very low. A fresh set lasts only for a couple of days. Using string savers is not a solution with these strings. The cross strings wear out from the outside, opens the thin core which at some point cuts the mains . I think I found a good competitor for these strings -- close in playability and more durable. Ashaway MonoGut ZX 16 (or 17).
From: Bedrock, 8/13

Comments: Before stringing, read the recommendations - it says to string at 10% higher tension than normal. I did not read it and put normal tension first. After playing with it I came to conclusion that it would be good to add a few pounds of tension. These strings are supposed to loose 6 to 8 lbs which is average. There is only Ashaway Dynamite softer than ISOSpeed Professional, but Dynamite losses more tension. These strings are much more forgiving in terms of shot precision and it is very noticable against other high-end multies. It is important to tune it up correctly to get maximum performance. It is a good idea to try different setups to get a more complete picture. (I used to play with much lower tension using poly at 52-57 lbs for some time and even played with tension and went as low as 45 lbs.) I do like these strings and bought a reel of it.
From: Bedrock, 4/13

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: It's a very soft and forgiving string, with good power and spin capability. Tension maintenance is not great but not horrendous, either. Personally, I like it better than Tecnifibre NRG2 or X1-Biphase or Wilson NXT (which just so happens to be made by Tecnifibre). The problem is that it does not degrade in a linear fashion. It's very disconcerting. At first, it wears like a regular multifilament string; it frays, but only a little bit. Then, out of nowhere, it "hits the wall." It's as if the outer layer explodes, leaving a thin piece of white nylon sewing thread. Still, if you can get comfortable with this string's peculiar pattern of wear, it's very good.
From: Rich, 4/12

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 those strings. 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: 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: 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

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