I've heard the PMC MB2 SE's sound tremendously impressive at shows.A real combination of bowl-you-over dynamics, a big sound, with timbral realism. Especially from outside the room, it often sounded like a live jazz band, and sometimes even something like a real orchestra, was pounding away from within the room. Then again..those PMCs do seem to be demonstrated at "turned to 11" volume levels at shows, to show what they can do.
I wasn't nearly as impressed by the smaller, narrower floor standing models I've heard from PMC. I found them competent, but unexceptional. (Then again, I haven't had time with them in really optimal conditions).