ISOSPEED Black Fire 17 String (1.25) Customer feedback

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Comments: Definitely not my type of string, very weak spin potential and even control. It is a powerful string strung at 52 lbs unlike what stringforum and the reviews say. The reason why I do not like this string is due to the string’s nature of not biting the ball at all. It just feels like it touches the ball without the string sinking in and the ball starts to boom out like a launcher. It is very difficult to control the ball with a modern stroke and I was struggling with basic consistency.
From: J, 3/16

Comments: Awesome string. Not much spin potential in my Babolat Pure Strike (not the best racquet for spin), but plenty of control and a surprising amount of pop. Love it!
From: Mac, 3/15

Comments: No reviews yet on this string so I figured I'd put in my two cents. I'm a high 4.0 aggressive counter puncher, and this is my new favorite poly. Really comfortable spin friendly poly. Easy access to depth while providing not too much power. I strung this up at 50 lbs in the mains with Head PPS at 53 in the crosses and it's one of the best polys at this price point, almost as good as RPM. Haven't tried it at higher tensions or in a full bed because you probably wouldn't get the best out of this string if strung above 55 lbs. I would reccomend this poly to anyone who wants a cheaper option from the big name strings, but doesn't want to sacrifice on quality control. I have hit with it for about 10 hours and haven't seen hardly any loss in tension. The only con I can think of is it's not as stiff as other polys and the slices can float a little bit, but that's probably just technique. 9/10
From: Grant, 9/14

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