It's built like a tank, and chugs hard when asked. What more could you ask for in an amp? Here's a quickie demo I did while auditioning some IRs the other day. https://soundcloud.com/user-669582196/mt15tt2 What I'm really digging most about this amp is the tone, more specifically the tone sweeps. They don't have a wide range, which is a good thing in my book. Instead, they seemed to have been focused more on usable freqs rather than useless sonic extremes of super flub, AM radio wah, and icepick attack highs. As a result, the amp feels very easy to dial in. As for the external build quality, again, no complaints. Thing's built like a tank. So yeah, if you're in the market for a high gain all tube chug monster then I'd definitely recommend one of these, especially when you consider you can get one for +/-$600 new.