I just received my Asgard 2 today. I had a short ten minute listening session soon as I grabbed it out of the box. There is no transformer hum whatsoever, the noise floor is low and it started to smooth out some of the pops and hisses from some of my older FLAC recordings that my DT880 loves to bring out. Comfortable listening level with Windows volume set at 50%, was around 1o clock or 2 oclock(slightly past halfway). I currently do not have a standalone DAC I'm just running RCA's from my HT Omega Claro PC soundcard which has 24-bit 192khz capability.
Overall I'm very impressed from the out of box experience. I've heard solid states don't take any burn in time and it seems to me like this is the case from the first listen. The amplifier doesn't really seem to add any coloration to the sound but it helped bring out the midrange and smooth out the detail in the high frequency range.
My headphone is a DT880 250 ohm. I'd be interested to hear the 600 ohm version and compare if anyone has tried it yet. I feel like the Asgard 2 compliments my DT880s as they are supposed to sound detailed, analytical, neutral, and bright in the high range. I noticed a slight increase in low frequency bass texture but not really an increase in actual quantity.
This is just my experience from the first 10 minutes I had the chance to open the box and plug it in before heading out to work on my research paper(ya I'm a poor college kid on a Schiit budget currently enrolled at SDSU). I will give more opinions as I get the chance to listen to it more but so far very impressed and also stoked that there is no transformer hum that many people complained about.