Get a 150. They aren't as rare, and are the same exact preamp.
I had a 120 back in the day. It wasn't bad, but if I had one major complaint, it's that for 120 watts, it's not a loud amp at all. I'd be jamming with my buddy who has a 5150. The 5150 was at 2 and I had my BV120 at 7 just to keep up. It helps if you crank the mids, but IIRC, the mids weren't all that great sounding.
I have a 150.now, but if I found another 120.for cheap enough, I'd grab it for nostalgia.