I've been happily using a B-8 for five or six years, mostly on 6x6. Part of my Goldilocks approach -- not too big, not too small, jus-s-s-st right!
I have 50, 80 and 105 mm El Nikkor lenses for it, and over time got the other of the two supplementary condensers. The only thing I don't have the official parts for is the lens cones (mine came set up for 35 mm), so I made some that seem to work quite OK.