It is amazing and beautiful..I have the US as well. Ac30 voice, ac30 top boost voice which is what I'm using here, and a '79 JMP voice, I can't even describe how great it is.. I haven't played through any of those actual tube amps, but I have the US super block and one of the voices is a blackface reverb, I had one of the reissues that I completely rewired and upgraded as well as a full set of NOS tubes and the quilter sounds far better than that thing ever did.. here it's serving as a preamp going into the pa, several people mentioned it sounded fantastic
I play it through a one by 12 at least a couple hours a day and it's such a joyous experience to just flip a switch it's on and it sounds beautiful, it can get incredibly loud, I've run it through my closedback 4x12 as well and it powers that quite well, they say it's equivalent to 25 tube watts..it's close I think both cabinets are 16 ohm
Highly recommended:)