I just bought one, I'm very happy so far!
I just bought one of these, a Prime 3.0. I'm very happy with it so far, it had problems playing Avatar, the electronic display is mounted crooked inside the case, but other than that I really like it. I find there is a few "glitches" with the menu's, not every screen navigates with the same buttons.
I don't really have anything to complain about though. After listening to some flac files and watching some mkv's last night I found I was VERY happy. I finally feel like I have completed my home entertainment system. My speakers are very high end from 15 years ago and I can finally really get some use out of them. Everything sounds excellent, looks excellent and just is excellent.
I'm happy. I store my files on a QNAP TS-859 and stream them to the DUNE Prime 3.0 (no internal harddrive).
I'm happy I just wanted to share!
PS. The only thing I am unhappy about is the lack of forums pertaining to this product. Maybe if they had a better distribution network in North America there'd be more users/forum posts?