I played a BV120 for a while. I bought it brand new after trying one out at Steve's Music in Toronto. It sounded good to me at the time as a 20 year old. I just wanted an amp with a shit ton of gain.
At the same time, my buddy bought a brand new 5150. I made the wrong choice. It was okay playing by myself, but in the band, it was nowhere near as loud as the 5150. He'd have his volume at 2, mine would be at 7 and still struggling to not be buried. The problem with the Blue Voodoo is that is has this fizzy high end, decent low end, but lacks any useful mids. It just can't cut through. You can cut the treble, turn the mids up, turn the gain down, and it helps, but I was always struggling to get a decent tone at band levels.
I didn't have the knowledge at the time, but I'll bet an EQ in the loop would do wonders for that amp. That, and of course lower the gain and put a boost in front.
I'd like to pick up another one at some point just to mess around with.
I'm almost positive that I heard Lee Jackson designed the BV120. Not sure though.