I am only a one foot in kvltist. I love my peavey basses, but I do not really care for the amps as much. I have a bass 400 and it's OK. The clean sound isn't terrible but it isn't super flexible and anyone who thinks it is a loud amp has not experienced a loud amp. Not that it wouldn't do well for a small gig, but it certainly will not doom. That is just my opinion. I used to have a peavey microbass practice amp that I actually liked a lot, but it didn't even compare to an Eden practice amp that I currently have. I gave that away to a kid who's mom I worked with who couldn't afford a birthday present and wanted to get her son something to encourage him to play music. I sold her a parts bass I put together for $50 and gave her the microbass and a cable. I felt like half of a good samaritan after that. I'd love to get my hands on a 3620 though. Those cabs look sweet and I did love the black widow in my old sunn 215b.
Yeah, I've never owned a Peavey Amp but they seem fine, I've never been that impressed except by their longevity but I know someone locally who plays through a monster Peavey rig with a T-MAX head and his sounds great.