I was into the idea of picking up one of these for a while. It seemed like a good idea for a long time. In the end, I couldn't pull the trigger because of two things. One, all of the sound clips I found of this amp all sound like jazz fusion/artsy metal lead/Satch tone. Discouraging. Two, somebody said, "All the tones out of this amp sound like Satch. It's all lead tone, no chunky rythym, all Satch lead tones."
Between those two things, I had to pass on this head. Also, another key factor you'll notice. There has been a huge 1/2 price used market for this head for at least a few years now. There has got to be some reason for this. I'd guess that if you want an amp that makes you sound like Satch, there is none better. Otherwise, you'll be giving up a lot of tone and flexibility.
Still could be a fun purchase though, since they are relatively cheap. If you like fast metal riffs without all the raucous/raw metal tone, this is your amp. It's an extremely good metal/fusion lead amp. Based on earlier research only. I never owned the thing.