Artists use this
A one-trick pony, but what a trick it is.
Let's be honest - this thing won't be replacing my JCM800 or my Orange Tiny Terror anytime soon. Does it do warm, expressive cleans? Not really, the cleans are squeaky clean to the point of sterility. Does it do that brown, vocal Plexi-type tone? Nope.
However, there is one thing it does well - Thrash/early Death Metal.
It actually does this so perfectly that I run mine along side my '800 in unison. The pairing is absolutely crushing. For that saturated, compressed high gain sound with a huge but tight bottom end, there aren't a lot of amps that can compete.
There is certainly a reason that Scott Burns tracked bands through Valvestates, and subsequently why we have all those amazing sounding classic records.
A lot of people bring up reliability issues with these Valvestates. Here is my experience with mine so far. Mine was made in 1997, and has never needed servicing. Never. I replaced the tube once about 6 months ago. That's all it's ever needed.