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 :evil: )
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.