After a few days, I'm really enjoying the B .
I like the body shape. Being able to set it down and having neither the mouthpiece nor the bowl touch the surface is handy with a hot unit, but the big change for me is the half-bowl. It took a while to adjust my heating technique, but now I am getting it nailed. I get two really big hits from one cycle and it kills the bowl. I should note that I did add one of the FMJs to the cap.
Daily drivers right now are the Air Max, the Dynavap B, and the all-glass aftermarket body with a Dynavap cap on a water piece, both with FMJ.
A clean all-glass path makes for amazing pure taste. The mystery glass piece I got is a weird recycler thing that I never would have bought, but is actually great. Taste is best dry but with a bit of water you get monster hits that feel like normal air; no throat irritation at all.