These strings were recommended to me by a local tennis shop. I was use to RPMs but I wanted to try some similar less expensive strings. I've tried black widows, red code, tour bite, MSV hex, and I didn't like any of them. Tried these and they're great! Definitely the most spin out of the strings. They're comfortable and the feel is nice. Also the power is there too. Only down side is that it breaks much more quickly than the others. I don't break strings often so these strings are perfect for me. Level 3.5-4.0 player using APD.