I have been playing with the Tecnifibre 320 VO2 Max for the past three years. I currently string it with Mamba Tennis Supra Natural Gut in the mains at 58 lbs and Discho Iontec Black (a poly) in the crosses at 55 lbs. Good spin, tons of power, good touch, and maintains tension for 10-15 hours of play (I put a lot of spin on my shots). I just tried a full bed of Discho Spin Monster (a very affordable poly)strung at 48 lbs and got excellent spin. This is such a great racket you can't go wrong!
Tecnifibre 320 Vo2 Max, 16G Mamba Premium Gut @56M, 17G iontec black @53C