Just picked up one. Great amp.
The best Marshall tone from an amp in a long time. And it's a Fender
Channel 1 is neat, nowhere near the Custom Audio clean but nice. You really have to keep the gain under 3 with humbuckers for completely clean sounds.
Channel 2 is the best Marshall sound in a long time. From Plexi to hot rodded 800 by turning up the gain. Wide open, lots of sustain and note definition. Talk about dynamics. Insane. I usually stay on this channel.
Channel 3 gain mayhem. This amp can do serious metal tones. If you want, but the 3rd channel is quite compressed compared to channel 2. Gain needs to be set moderate unless it chokes the sound.
Really quiet even at the high gain channel, channel switching is very fast. It has a good fx loop. Incredible sustain, really outstanding. Harmonics are effortless even at low gain.
Tone controls are working a lot better than on many other amps. Sound best with it's own cab. Tried it with a G12H loaded 412 and a 2x12 loaded with V30s too. It can be set to sound good with any cab, but you have to tweak it with your ears not with your eyes. Settings can seem weirdo, but if it sounds good, be it, definitely not a beginners amp.
Too bright? Work on those tonestack and presence pots. It's a giging amp, and cuts through like a knife. It can sound muffled and buzzy on bedroom levels, but come on, it's a hundred watter.
It's a keeper for me.
PS.
Dave Friedman recommends to set the bias at least 120ma. I did it, and sounds even better.