I demo'd one of these today. In a word...awesome. All 4 sounds were highly useful, and the "topology" makes each amp take on multiple characters. The "quiet mode" sounded very good, but run full-out was where it shined. I don't do clean tones much, CH 2 - Brit - sounded like a good mid-gain Marshall (think 800/900 um-modded, no boost), CH 3 was Vox-y, and would probably flat-out KILL with a good boost/OD, and CH 4 had a really cool hybrid Marshall/Mesa tone, with a TON of gain even at noon. I liked it best with the lows @ 10:00, mid @ 3:00, high @ 10:00, and presence @ 3:00. Any mode Class A/B, A, pentode, or triode sounded great with that model. I was pretty impressed all around. It's one of the first amps I've enjoyed playing without any effects...and I HAVE TO HAVE effects to enjoy my own playing...yes...the crutch.
I'm likely going to grab one of these as soon as I can move a few things. I had sworn off tube amps once i picked up my AxeFx 2, but I think if I grab one of these and the Pod HD, it will probably get as much use as my AxeFx. It's a REALLY GREAT sounding amp. I've had a Pod HD before, and it sounded really good too, but didn't work out at the time. I don't gig, but I was running it pretty loud at GC, and it didn't flake out like most L6 amps tend to do. For a guitarist on a budget, I think this coupled with a Pod HD could really be a great Swiss Army Knife amp. Heck...a great first amp if it covers the tones you need - and it covers a LOT of ground.
Anyway, if you even have a twitch of interest in Line 6 stuff, check this amp out. I was not really interested in this amp after hearing most the online clips, but it's a far sight better in person. Let the GASing begin!