I had one
albeit I didn't have it very long, it was a pretty ridiculous amp
to be honest, not as high gain as you might expect. Kinda of smooth sounding, articulate, and very tight and dry. If you want a lot of gain, you'll definitely need to be boosting it.
LOUD LOUD LOUD, it's insane. The volume taper is crazy, it goes from silent, to barely audible, to ear piercing.
HUGE HUGE HUGE bass. The bassiest amp I've ever owned (didn't help that I played it through an Orange 2x12 though

)
The gain reminded me of a 5150 for some reason.
That being said, I'd probably want to get a Quickrod. The nitro was a bit too bassy for me, and the mids were too low for me.