I got an MZero Od right when they came out. Still have it. They made some changes later after the first few batches IF memory serves,,changed the volume taper or something like that,,,mine had the touchiest volume knobs I've ever come across. A bump from 1 to 2 on the knob is like a 50db increase! That aside, I loved Channel 1's tone,,,couldn't really gel with the OD channel for some reason. Maybe too rounded on the bottom end like others here have said. I put a Cusak V2 screamer out from of Channel 1 and dimed the channels gain,,,and it rips!!! Channel 1 had something very cool boosted, but at that point I was not using the Channel that is the amps namesake. I also remember it ate the new El34s it had pretty fast,,,maybe 6 months. That's when I shelved it and moved to another amp for a bit (Gower Marshall KK+)