I don't know anything about the BC15, but I have a V5 here. Had a couple V55s as well until this week. Contrary to some reports by the astroturfers, the construction of these things is first-rate, better than some big-name amps I could mention. Professionally laid out heavy-duty circuit boards, high-quality components, ceramic tube sockets, orderly wiring, etc. Cabinet and covering fit and finish is great. If you didn't know any better, you'd expect the pricing on these things to be much, much higher. I'm sure I took a pile of pictures when I disassembled the thing, but I'll be damned if I can find them. I'll update later if they show up.
Anyway, the V5 has a very good clean sound, but I'm not as impressed with the "dirty" sound. Gain and volume are separate, so you can overdrive it nicely, but I would have liked more saturation. That's just me, though. It's an all-tube path, with 12AX7 pre amp and EL-84 power amp tubes. The reverb is solid-state, but it's very clean and realistic sounding, unlike some analog tanks, but it is possible to adjust it too far so it sounds cheesy. Of course, that's true of most SS reverbs.
It's pretty nice for a little practice amp. Of the various 5 to 12 watters out there, this is the one I'd recommend.