The K Pro Staff. I cannot believe how much plow-through this thing has. I know I've ripped mid size racquets in the past, but I'll be damned if the hitting session I just had didn't feel incredible. I use a PHT/Xcel hybrid and it works magnificently, especially after it's been broken in. What I love about it most is that it works more effectively the harder and heavier your opponent's groundstrokes are. Hitting on the rise, touch shots, and, for me, absolutely unloading on forehand returns - that is what this racquet was made for!