You guys all need to try this thing. It's been nearly 5 months I've had it now and I'm truly amazed they put a Marshall and a 5150 in a lunchbox and made it this loud.
The switching with the multiple footswitches is a chore and the presence knob adds presence in a weird frequency. The amp has a bit more noise than I'm used to so I did some tube rolling with the preamp tubes. One interesting thing I found is that throwing a 12au7 in V3 really brings down the volume of the amp. This is sometimes a good thing. I think the amp sounds better in 50w mode, but it's LOUD, and I am used to 100w and 150w heads. It keeps bass definition at loud volumes too since it has the big bottle tubes and the big PTs.
I do like keeping the presence knob off and sometimes just for kicks just adding presence with the button on the back. Though that does at a signficant amount of fizz - has to be the right song for it. I'm finding I get a heavy saturated sound out of the lead channel without needing a TS in front. Running a TS or SD1 in front of the crunch channel is the most glorious Marshall sound, even with just keeping the 6L6s in there, I have not tried it yet with EL34s.
I've had a lot of full size amps, and a bunch of the lunchbox amps too. This amp is the king of lunchbox amps and IDK why more people aren't buying it and trying it. It's awesome. It's a full-size 50w angry screaming munchkin of metal and I love it.