My experiences with the O!Play have been mostly positive (plays most files, and well), but there are some bizarre issues I'm having... On some DTS files, the audio becomes out of sync with the video, actually going faster than the video stream.
This is while connected via ethernet (CAT 5e) to my home server box. When a portable drive is connected via USB to the O!Play, the content plays fine, with no sound/video sync issues.
There are other bizarre issues: with most .MKV files, you have a full range of FF options (2X, 4X, 8X, 16X, 32X) but with others, you get (at most) up to 2X FF.
I'm trying to diagnose these issues, but it seems like the o!play is a little bit finicky... Perhaps a firmware upgrade will fix these issues, but they are troubling...