Looked at it, but you're right. The family is "invested" in Plex and it would be difficult to change. The Plex app for Android works really well, and I know where many of the landmines in Plex are. Having the Tablo channel available is a "nice to have" feature, but we use Plex mainly for our collection of TV shows and movies -- amounting to about 7 tBytes.
We also use Droid TV alot, and we have it set up to FTP the new files from the Droid Android STB to the Plex Server, as well as removing the current shows we've watched. Started using Droid TV while posted overseas (it's ideal because the Droid servers "push" programs to your local STB and are not speed sensitive like streaming solutions). Now that we're back in the US, we love that it is commercial free.
Once I get the new C7 router installed this weekend and move the phone PBX, I'll probably take another look. In the meantime, I'll just use the Roku for live stuff.