I've got an all Polylon job now, and a couple of weeks ago, I had perhaps my best hitting day ever. I was hitting everything (well, almost). I know for an absolute fact that if I had Luxilon, or natural gut, or whatever high priced string in my racquet on that day, I would not have played any better. The same can be accurately said of any other day. That's the bottom line to me.
It's the player.