I received today my Asgard 2 and would like to point out a couple of things regarding what's been said at the beginning of this thread, and which had me kinda worried while I waited for delivery.
1) There is absolutely no discernible transformer hum at all, even with my ear against the chassis (this is the European 230 V version).
2) It's a class A amp. It does get warm. But it's been on and in use for the last 5 hours and it's definitely not "hot" by my standards, on the top and on the sides of the chassis. The bottom is definitely hotter though. But IMHO heat shouldn't really be a concern to anyone as I don't think you could ever actually burn yourself.
As for a proper sonic review, I will leave it to others since I don't have much experience (if at all) with HP amps, and like I said I have only used it during one afternoon. The only other HP amp I tried was a Fiio E12. I had it for a week and returned it as I found it harsh to listen to and there was a constant noise floor with sensitive HPs, regardless of volume knob position. On the other hand the Asgard 2 is silent unless the volume knob is turned fully clockwise (with no music playing), and it sounds just proper. Transparent, no obvious coloration. Just what I expect from an amp.
I must admit I bought it mainly for convenience reasons more than as an upgrade in SQ, as the HP out of my integrated home stereo amp (Yamaha AS-500) sounded already quite fine to me. However, the good surprise is that with the Asgard 2 the lows *definitely* hit lower and punchier. Almost scarily so on my V-Moda M-100, I might add. Due to the available power I guess. I learned here on head-fi that I'm a bass-head so I'm very satisfied with that !
It's very, very good sounding, but I can't really comment any further than that. It might sound more detailed overall, ie I seem to feel more into the music, I hear more of the recording room reverberation details, etc... but I'm not sure though, in all honesty it might as well be expectation bias. I'd have to do some proper ABX testing to tell any actual differences at this stage.
Anyway I'm very happy with it, it does what it's supposed to and it does it well
And now the icing on the cake : it's even more gorgeous looking in real than in the pictures