I purchased the Audio Rack and Amp Stands from Chris at Timbernation. I had him inlay walnut with maple and used walnut legs on the Audio Rack. Chris is a joy to deal with.
Sorry for the late response. Thanks for taking the time to look at my system. You asked about the good and bad of these amps.
I'll start with the Art Audio Quartets. This is my second pair. These were the pair used in the Francisco Duran review in Positive Feedback. When Joe at Art Audio got them back he had a new input transformer he wanted me to try. As soon as I got them there was no question these were more musical with even deeper bass than the originals. These amps really have no weak points imo. They are tuneful from top to bottom with both dynamics and detail. With these amps my system sound is as close to live music as I have ever had. They also have no trouble at all powering the Andra 1 speakers which are notorius tube amp killers.
The Viva Auroras do not fair as well with the Andra 1's. They sound wonderful to be sure but do not make the tuneful deep base of the Quartets. They also sound just a little rolled off on top, but the mid range is Viva! Simply wonderful.
My previous amps were a Plinius SA 102 and a Bat VK 500. These are both great SS amps with my nod going to the Bat. The magic of tubes is what made me change. Once you hear them chances are most folks will prefer them.
My next stop is analog. I had a chance a few months ago to hear Albert Porters system. It was simply spectacular.
thanks, Walt
***I am a dealer for both the Eggleston and the Art Audio gear but only after becoming a customer first.
Update: I am getting my Viva Aurora's upgraded to the current version and am using Art Audio Quartet monoblocks now. These amps are just breaking in but, so far, they work very well with the Andra's. I will post pictures later.