Sound is killer. And it works nearly perfectly in Sonar - the 'Auto' quality doesn't work (at least on playback) and I couldn't get the high quality to run for more than half a second, but it seems to work fine.
A few things:
-Changing between tubes and bias pretty dramatically alters the volume, making it quite hard to make an informed judgement on which sounds better. Not sure how easy it is to do, but making it so that the volume stays relatively the same would be a huge plus.
-I'm not a huge fan of the GUI. Instinctively I reach for the output knob on the right.. you go from the input on the left, and then go in order left to right ending with the output knob. It feels out of place on the left. Maybe that's how the real amp is, I dunno.
Also, the buttons can be hard to tell what's just been activated. Eg. the 'red ch. mod' switches between Plus and Standard.. but is Plus pushed in or pushed out? The power knob also seems to do nothing XD
A great amp but a few improvements here and there (not so much to the sound but to us getting the right sound) would make it a lot better imo.