I'd be REALLY interested in what you think once you've tried it out so please keep me informed.
Okies... we've bought one

It does everything it says on the tin...
It's my birthday present, though - so I don't get to see it again until March 1st...
I went for the Dual amp and the 112 cab. If I was gigging I'd have gone for the 212.
I was using one of the Pacificas to try it out - had a humbucker in the bridge and a P90 in the neck, very tasty. While the guy was wiring up the amp & cab I used a THR10C next to it to dial in my "stock sound" that I'm familiar with to use as a "baseline". We discovered I could run the 100 through the 112 even quieter than I do the THR10 at home and still get some nice guitar and amp interaction.
I spent about half an hour messing about, but I
knew within minutes of plugging in. I've barely scratched what it can do, but WOW...
I concentrated on the Crunch area because that's where I live most of the time for guitar sounds. I got some really cool sounds out of it. One was very close to my Laney CUB 12 running at a volume I wouldn't be allowed too often - but at barely a whisper. I also played with Clean and got some sweet "fender with a bit of hair" sounds. I can see me using Lead a fair bit, and I could see some uses for Modern. Actually, thinking about it, I didn't hear any crazy modern metal noises - maybe I wasn't trying out the valve combinations you'd need to achieve that.
It does EVERYTHING I'd need though - the three main types of Fender, Vox, and Marshall sounds I'd use for rock, blues and everything else.
I tried the "both amps at once" and, going through a single speaker, it was as I expected, OK but didn't set my world on fire. I suspect running through separate speakers could get very nice, and I intend to experiment with using it on recordings (using the line outs to separate channels).
Oh, and I tried the Boost on one of my Crunch experiments - not sure which boost it was, sounded like a clean one. That was quite tasty. I got enough from that to figure out I can have "more" on any amp setting, so I didn't bother with it too much after that.
Whether this amp really is THE "game changer" some folks are talking about, I don't know. If I was gigging and could use a loud amp, would I really go for something other than a Marshall 1974X or something? I dunno. I kinda suspect this might actually be the amp to do it.
But, no matter, this thing is really satisfying to play through and makes some truly gorgeous rock and roll sounds at manageable volumes. And setting it up feels really satisfying - the knobs feel nice, I think it looks cool and business-like. And it's REALLY easy to dial in sounds.
Over all, wow, loved it. Can't wait to get my mitts on it in March!

BIG THANK YOU to Richard for taking the plunge and posting this thread