This is a great string to play with. I have strung both my Dunlop M-Fil 300s with this, one as a hybrid with Babolat Super Fine Play 17, the other with a full poly job, and have also compared this with TF Redcode and SPPP hybrid and full). The Gosen PSP is a surprising soft poly to play with. It gives a tremendous amount of power and control on serves and groundstrokes. Spin generation on slices is also amazing. What really swung me over to this string is the comfort level - it doesn't feel harsh for a poly, and has good elasticity. The strings also don't move around much which is great as I dislike having to readjust strings. The best part is, this is a highly affordable and durable polyester compared to SPPP and TF Redcode. If you've always wanted to try a full poly setup but have been concerned about harshness and a lack of feel, it's time to give the Gosen Polylon SP a second look.