Just hooked up the ODAC, impressions soon....
Edit 1: So far, very impressive! Definitely a good sized step up from the Fiio E17's DAC section. Very detailed, but still very musical. It didn't transform the sound into a bright digital sounding mess like a few people claim. It isn't making my Q701 unlistenable like I've heard some claim either. I'm not going to give a huge detailed review yet, but so far I'm very happy with the difference for a mere $115. I will say that it is definitely a step up from the E17 in every way. Tighter bass, bigger soundstage, better separation, definitely better treble detail.
Edit 2: I am currently listening to Opeth's "The roundhouse Tapes", and I just heard fans cheering in the background during Blackwater Park in a section of the song that I most definitely never noticed before. It was very faint and distant, but it was there. It made me imagine that I was there at the show for a minute. Very nice!
Edited by jasonb - 8/26/13 at 5:34pm