Valuable info, thanks
When you say Plex, I assume its an app that is available on the Roku. You use it to connect to a media server of yours? Windows share? Any connectivity issues?
WDTV connecting to Windows shares is a nightmare, and is just not reliable at all...
I have a microserver running as a media server which runs PLEX on top. Once you have created folders in PLEX for movies, series, home movies and pointed PLEX to the respective folders on the drives, it catalogues and indexes all of the files and downloads covers and info for each episode \ movie. Think of it as the DSTV Explora but on steriods - it is an awesome piece of software.
ROKU then has a free app which you run and this connects and streams the media from your plex server. I also have the android PLEX app so that I can stream to my phone. You can do things like watch a series episode on your tv, then halfway through stop and resume on your phone or other ROKU.