Word over at
www.sevenstring.org (where I mod and kill most of my 'net time) is that it's a modeler that combines about the best digital preamp that anyone's heard with Eventide-quality effects. The dude who designs them is supposed to be a big Mesa nut, so the Mesas in particular are supposed to be phenominal.
The clips I've heard haven't really overwhelmed me, but I could say the same about half the "real" Mesa clips I've heard too. :lol: Also, it's worth noting that one of the comments I keep hearing is it "feels" like a real amp, much more so than any other modeler.