Well I think I can chime in a bit. I had the Asgard for the 15 day trial, and had it burning in the whole time, with only a coupla breaks. There's a few things I didn't like about it. It made my k702s HARSH. Yes, it had plenty of power, but it was definitely more harsh and grating on my ears than I had ever heard it, and it was the only time (after burnin) that I didn't like the AKG. It actually sounded smoother straight out of the uDac-1 and also the Maverick D1 to me, even though fairly underpowered on both. The M-Stage for me (modded with PLUG AND PLAY browndog/op627 combo unit) sounds mindblowingly incredible, out of the gate. It is VERY smooth with the 702s, has huge power in it, tames the highs and harshness brilliantly,and brought new life to the bass. I thought there was no contest between these 2 amps for the AKGs, unlike the poster in the link above. Another thing that I was concerned about with the Asgard, is that it developed MANY MANY white spots all over the unit the more I used it. They were clearly 'fingerprints', but looked like chalk marks, and would not come off. I personally think it may have been natural skin oils burning onto the unit or something, cause I have no other explanation for it.
As for the Asgard/DT880s, I can't say specifically, but I did pair the DT990/600s with it for 2 weeks. It was nice because they were grossly anemic and weak from the uDac-1 and D1, but sounded plenty powered and good out of the Schiit. I noticed a great amout of seperation and details from the combo, and I enjoyed them thoroughly. My .02
-Daniel