I know this subject has been beaten to the ground, but after playing with a "tweener" (leaded up Yonex RDX300), I have some interesting observations. Note that I recently made this change and had been using player rackets for my entire tennis playing life. 1. While tweeners are more powerful ounce for ounce, due to the lighter weight, it seems you actually have to swing faster than a player racket to get the same power. 2. Maneuverability a plus for tweener. Stability on hard returns a minus. 3. One area where I noticed a decrease in performance is control on short balls from the service line to the net. With the tweener, I didn't have as good placement as a player racket, and was more likely to hit balls out. 4. Serve. Edge to tweener. 5. Groundstrokes/volleys. Same. 6. Forgiveness. Edge to tweener. Overall, I prefer a tweener, but the only area which really bothers me is #3. With a player racket, you can put away short balls with precision, but it's harder to put the ball away with accuracy with a tweener. I realize these observations are just generalizations since there are a range of tweeners and player rackets.