This poly strings are very arm friendly and generates lots of spin.
I use this string with the mains and Synthetic Gut 16g with the crosses at 55 pounds and it works out just fine. Great feel and control without sacrificing power. You definitely get a good bite on the ball too for that nasty spin specially on your kick serve!!
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.