I had heard an early version of the Gungnir by itself through my stat amp, and I thought it was pretty darn good. A little bit soft with blunted transients back then with the older analog boards. This time around, there was no such issue, but I didn't have my own amp, so I'm extrapolating a lot of factors because the Mjolnir is different too.
At $750, I don't expect to it have PWD2 (my reference) detail and resolution - I just don't want any weird flaws such as slow or muddy bass, strident highs, lack of low-end extension, compressed dynamics, tight bass, rolled off, etc. I would have to say that I'm impressed. It sounded like Schitt is aiming for a neutral sounding DAC not too different from the Bifrost, not one of those really warm thick sounding organic DACs. I do feel that the Bifrost has an apparent mid-bass boost which the Gungnir didn't have (IMO, this is a good thing, less coloration and more neutrality with refinement as we move up.) The Gungnir is more powerful down in the low bass though.
As for the Mjolnir, Jason was very receptive to our comments regarding the pairing with the HD800. I think Anax had less of an issue with it than me. I'm more treble sensitive than him and prefer a darker sound. Even then, they were very close. Finally, take everything with a grain of salt because these guys aren't done tweaking their gear yet.
It was kind of neat to go up the ladder from the Asgard, Vahalla, Lyr, and Mjolnir and hear how each amp was uniquely voiced and sounded successively better.