Great Amp, Period. Harmonics, responsivess, warmth, power, sustain, thick syrupy leads, and great clean tones too! It has spoiled pedals for me. There is no drive pedal that I want to hear in front of it (execpt my AM Sunface). Everytime I use one, I realize that the amp sounds and feels so much better. The challenge becomes negotiating those gigs that are too small to crank. No attenuator for me. Maybe I'll jut switch to less effecient Heritage 20 watters and go strictly with a clean boost (which I can tollerate).