Anyone still plays with this string.... 6 years later? I have ordered a few sets to try, was just wondering.
Tested a couple sets of it a few weeks ago. It was weird for me. I generally prefer crisper strings--played tour bite as a main string for 6 years and have almost always come back to it, though I use ALU Power now and will probably stick with it. The Firestorm had nice power on tap and a soft, responsive feel on impact. Decent spin if you can generate it. The weird thing was that I felt disconnected from the ball the entire time. I tried it at my usual 48 pounds, then went up to 51, then 54, and I got the same sensation at all three tensions. It felt vague on impact like I couldn't tell if I hit the ball clean or not, even though it was coming off generally as expected and staying in. This was fine when I was volleying or using anything with a continental grip, but I primarily play singles and don't come to net frequently, so I didn't quite groove with it. I could see how somebody looking for a softer and consistently playing round polyester might enjoy this string. If I were looking for a softer string or only playing doubles, I might adjust to and enjoy it in time too...I just think I'm so used to getting feedback from crisper strings that it threw me off.
TLDR: Soft poly with decent control that yields a bigger sweet spot than ALU, Tour Bite, Poly Tour Strike, Hawk, and the like for me. Feedback like punching a pillow when the others I mentioned are like hitting a wall.