It rules, truly. I have used one for two years. Only reason I sold it was that I wanted a tube-head again (sold the entire rack).
When they came out, they were like $3000. They were state of the art then and all the options still are. It doesn't sound dated either.
Channel 1 is solid state clean, but what a clean. Sounds better than most all-tube amps I played/heared. From warm and dark to trebly with a lot of attack. Almost impossible to distort.
Channel 2 (tubes) is Marshall territory. It can do a really great clean sound, but you can also crank it up till JCM800 territory. Really cool!
Channel 3 (tubes) is all high gain. It rips! Dynamic, very punchy. Great fluid leads or heavy rythem. Very quiet on noise (try the Triaxis on high gain
The EQ is very sensitive. You can do alot with it (128 discrete steps to dial in!)
There are many more buttons to push (very handy mid and treble-boosts!) , a lot of effectloop-possibilities, and some handy switch-jacks to control other stuff. All sounds can be stored in 128 presets. It really can act as the brain of your setup to0 (midi-mapper, effectloops, switcher,etc.)
I could have bought a Triaxis at the time, but I liked this one better, really!
If you got any more questions, feel free to mail me.