I just ordered 2 sets of the Babolat VS Natural Guy 17g. I've read that its preferable to have synthetic gut cross strings to improve durability. Also, what's the preferred tension? Usually I have it at 55. BTW I'm a high 4.0 with massive flat serve, big FH topspin, and flat backhand. I know I'll probably replace these at least once a month, but its more important to me to have a racket that doesn't hurt my arm/shoulder, as Dr. Appts and physical therapy cost much more!