This amp is the real deal. I won't go into a long superlative ridden description but suffice it to say that even only having had it for a short period of time this clearly is the best amp I have personally owned up and until this point. I actually really like the primaluna prologue two but this amp is in another league. Holographic like presentation, better instrument separation (I didn't think an amp would effect this as much as it does ?), liquid midrange. (wait I thought I said I wasn't going to use a bunch of superlatives .. dammit!)
A couple of cool features: dual mono design, treble pots that are not in the signal path to help with speaker matching, all tube (EL-34, 6922, OA3 [voltage], 5u4GC [rectifier],point to point wiring, hand made in Illinois, lifetime warranty even if bought second hand [which I did] you can send it back to Decware and for a reasonable fee you can get a new lifetime warranty, can be used with or without a preamp, and damn sexy imho!
Best impression so far is that it makes my digital front-end sound way better. Of course my VPI Classic also sounds sublime but the biggest improvement, to my ears, has been on the digital end. It takes away a little bit of that harshness and gives a fuller more pleasant sound.