Just got my A2. Only been listening for about an hour, but first impressions are: Great detail, not overly bright. Very nicely built, no transformer hum issues, and output is silent with full gain and no input (always a good sign). I can hear the slightest of hum if I press my ear against the case, but only then. This is completely fine, and is not indicative of any problems. My setup is FLAC -> uDAC 2 -> Asgard 2 -> HD 650. The Asgard appears to have plenty of power to drive these headphones to ear splitting levels. I prefer the low gain setting.
Pros:
+Excellent build quality
+Thing looks great
+It will keep my hands warm on a cold day
+Detailed sound, but not overly bright
+Excellently balanced potentiometer minimal channel imbalance even when nearly off
Cons:
+Bass impact seems a little low, but that might just be the HD 650 isn't known for crazy bass
Overall, I love this little amplifier already, and if it holds up, I would see no reason to replace it
Good job Schiit, as a fellow engineer, I am impressed with the build quality, price, and performance. Keep on making great products!!!