Ordered the Mimby/Valhalla 2 and had been previously using nothing but USB for my hi-fi audio previously.
I added an Uptone Regen to the USB chain and that improved things. I was happy as a hog in Schiit. Until on a hunch, I pulled out a Sony DVDs player I had laying around and plugged in the digital coax to the Mimby. Now, I'd heard people bitch about USB audio before, and declare the superiority of SPDIF, but I ignored it. USB to SPDIF converters were too expensive and I loved the convenience and compartmentalization of computer based audio. I even got excellent results going from foobar to JRiver and finally to Bughead Emperor, the best computer audio program I'd ever heard, by a country mile.
But that Sony dvd player with digital coax into the Mimby smoked them all. I really didn't know just how good my equipment was until I popped in a CD and used digital coax from a CD player. I immediately sold my Regen and USB cable and have ditched computer audio entirely. Compared to coax, USB was was noisy, grainy, and veiled. Of course I wouldn't have said that when I was happily using USB but I didn't know what I was missing.