How do you live with that Roku Plex App UI? Gross. LOL.
I've been running a XBMC powered "Aeon Nox" skinned HTPC for a while but would love to dump it in favor of a Plex app that looks like that on my X1 which is so much quieter. Here's hoping that it runs good. My libraries are fairly large (ie. > 1400 movies and > 100 TV shows) and run like crap on Roku's, AppleTV, etc. Hence the brawn I have brought to bear up to this point. We'll see. Hopefully not too much longer.
The media player preview app that's already out will actually play a lot of that content, the only exception being stuff with DTS audio tracks, and because Plex is the DNLA server, thumbs are presented and content categorized nicely. So if you don't care about UI, meta-data, resume, filter, and search capabilities you might give that a go now.