If you're running XBMC then you wouldn't need Plex. They're both media centers. I run Plex Media Server on a headless hackintosh that serves out our family's entire Blu-ray collection. We have two teenagers who are the primary users. All in all we have the plex client on 2 MacBooks, a Windows 7 PC, an iPad, and now the Apple TV3 hack in the living room connected to the HD projector. I'd like to get the kids ATV3s for their rooms so they don't have to use their computers for Netflix, Hulu and Plex when friends are over. Seems like their bigger TVs just sit there doing nothing these days. PlexPass is also another nice feature that allows syncing for when you're on the road. Plan to use that this summer and best of all my daughter can do it herself.
It's all about simplicity. There's a lot of options out there and there's no wrong way to go about it. Before moving to Plex I used simple iTunes home sharing with the ATV3. That was before I ripped a cabinet full of movies. Whatever works for you.
Hi, were you able to confirm if the apps/channels were available on your ATV with the hack?