Got my HALO-B in the mail Friday. I had my "A" upgraded, and got new smoke shell. (actually, they just ship an entirely new unit).
The B's have quite a different impeller design, and no springy-things to get PB's caught on. It's also a LOT quieter.
I just rattled off 2 bags (1000) PB's, and it seems to work just fine. BTW, I never had a problem with the "A", I just felt compelled to do the upgrade.
I have also removed .700" form the powerfeed tube of my H/L mainbody, in an attempt to lower the hopper as much as possible (need lo-rise, need lo-rise) Damn, this thing sticks up high...