I have one, it is my loaner amp for when I am repairing an amp.
It is pretty versatile and maybe a little flubby as mentioned earlier, but I find rectifiers to be the same without a TS.
I don't think they sound amazing stock, but they definitely crush most amps in their price range without a doubt. But it is definitely good enough that people often don't want to return it.
The company is also really really cool about helping with repairs and giving out schematics and such. So no problems there.
However I do have some issues with their design. The amp is a bear to work on. At least everything is clipped (unlike Mesa) but there are a lot of jumpers to deal with. I think the components on the power supply section are too close together causing overheating of the caps. But usually the first repair will take care of that with higher temp caps and placing them with a bit more room. Later designs I think took care of this problem.
The one I got was biased pretty hot (used, so who knows), so you HAVE to rebias to keep things sane. It isn't like most tube amps that bias super cold.
I put JJ's and TungSols in mine and that definitely opened it up. I would be pretty happy if it was my only amp. But it just doesn't have as much character as my ENGL, and Mesa's, if that makes sense. It does hold its own though.