Roberto, a year ago, I'd say stay with one racket all the time. But, I bought a couple of PK 10g PSE's. I had been using the PK ki5. The 10's were a little more head heavy, and I was finding my self just a little late on my forehands. I went back to the ki5. But, when we play on clay, I decided to try the 10's again. On clay, I was usually early on my shots. It worked out well. My groundies were great with the 10's on clay. The drawback: Volleys. The ground doesn't come into play so much when you take the ball in the air. The rackets play differently. I just haven't been making as solid of contact on volleys as I'd like. I get used to it as the match goes on, but sometimes that's not good enough. I'll probably stay with this strategy for this season, but who knows, maybe not after that.