ok all you RPM Blast Rough curious players........... It is a very good poly,, also used by Jack Sock now. ok ok, he lost early at Wimbledon but that wasn't string's fault, Jack had a leg injury, really should have skipped Wimby.
Anyway, This poly is Superior to regular RPM blast in every way. More forgiving on the arm(much softer), More power(string seem to have better ball pocketing due to softer material), Thus providing better control. Spin you say ? I would say Spin potential is at least Equal but on the serve, I was actually getting slightly more RPM on my serve, can't explain why exactly..... I was making this 4.5 guy who normally crushes returns(especially 2nd serves),,making him Mishit his returns. At one point, he mishit 5 returns in a row, after which he finally made the adjustement and decided to stand Way back even on my 2nd serve......LOL