I broke the bank and went with the PowerBreak Pro with an H shaft (the heavier one you see in those pictures.) It really is amazing. It's very effortless, easy to control, and you get an incredible spread. I tried the BK3 first and bought the Mezz sight unseen.
I let Busty try it out and he loved it. I can give it to APA 2's and as long as they hit the rack square, you can definitely tell the difference between that and most of everything else.
The great thing about Mezz's is that they hold their value. If you don't like it there's always someone who will be willing to buy it. I never tried the PB2 (Shorty) because I wasn't sure if I would like the change. And I don't know how it stacks up against their other break cues either, but in my experience it's worth it to spend a little extra money for the return.