I own PB2 with DI shaft.
I tried several Break cues: predator BK and BK2, J&J Break Jump, Mezz PB with PB shaft, Mezz PB2 with PB and DI shaft, Players Break Jump, J&J Spark Break, and Fury Break Jump cue.
I can say that it is one of the best Break Cue I ever had. It transfer power more than other cue (my friend said that the only cue that can be compared to it is Stinger BJ, but I had never tried that cue).
It is slightly shorter (around 4 inch) so it will transfer more power, and also DI shaft is stiffer than PB shaft.
For the money, J&J Spark Break is the best one, but if you are looking for balance, i think that Predator BK2 is better. But if you want power, Mezz PB2 is the best Break cue.
Hope that help, you can PM me if you need more specific information.