I'm a 4.0 player. I hit more topspin than I probably should with big strokes. But I only play about 10 times/year and I don't want to have to restring my racquets all the time. I recently had to replace this spring before it broke because the tension had finally gotten too low. This is a first for me. The trade off for the durability is that it feels really harsh at 58lbs. Hard on the elbow. I'd much prefer a topspin string, but then I'd break it within a few sessions.

Crossfire II has a great feel to it.

Play twice a week, long rallies for a good workout. Needed a durable string that has good feel, friend recommended this and like it. It has bite for those who like spin, yet power at the same time. Try a lower tension as the string can feel firm at first.