Has great sounds in both the clean and the reverb channel. Unfortunately, when you switch channels, you have to readjust everything because the jump between channels is too big. It's like going from 1st gear to 4th gear. There is a simple mod that fixes this though. The stock Eminence speaker is actually pretty good. It is a loud little monster and definitely has the Boogie, Mark series type of sound in the lead channel and if you set it correctly it can could amazingly like half of a black face Twin Reverb (I have owned 2, 65's) in the clean channel. I like that it is simpler than the rest of the Mark series, in that it is simpler and doesn't have any pull boost pots.
as bosstone hinted, there is not much seperation between channels so a great clean and high gain pair of channels is not achievable as you have to re-adjust a couple knobs. but for the money, they are great amps. I used a Studio Caliber 22+ in the studio for a nu-metal thing years ago and it kicked much arse. a great amp that is often overlooked