I hate to say it, but I have the Gungnir with the gen 2 USB and the iFi iDSD, and the iDSD sounds MUCH better. I kick myself for it in some ways, but I have subbed the Gungnir in and out several times, and the iDSD is just MUCH more natural. The Gungnir sits in a corner. I refuse to sell it because I like to put it back in every so often just to convince myself that I'm not hallucinating!
So, can you use it as a dac only?