I own a few RDX500's MP's and I'm interested in hearing what other users string theirs with. I like to use mine strung with Luxilon Big Banger Alu 17g at 55lbs. I find this gives me loads of spin and enough control to allow me to hit out, but still provides me with enough power to put balls away without much too much trouble. The flex of the racket goes well with the stiffer string and allows a nice compromise. I've just bought some SPPP and i'm looking forward to seeing how it compares. I thinking of stringing it around 58 - 60lbs. Does this sound about right? I like to take pretty big cuts at the ball.