I've only ever heard my friends, but this is hands down the best amp I've ever heard in real life. And I've played a JCM800, AC30, Fender Twin, Roland Jazz Chorus, and an amp the Doobie Brothers used on tour. This takes the cake. Not sure what pre he was using, but it was a Mesa Boogie also. The clean tone is perfect. It has clarity but also a bit of twang and loads of sustain. I think this is true for all the Mesa Boogie products because of the class A/B configuration. I've leave a better review once I try this with a distortion pedal, but obviously it's going to sound amazing. I'd expect it to be kind of a cross between Nevermind and the Black Album.