Air Video works pretty well but some times it seems to become rather unresponsive. I am not sure if that is due to Wifi problems on my end (I doubt it) or if the app is just not that solid yet. It doesn't work that well for my TVShows folder since there are hundreds of files in that folder. It works much better for my Video Library folders. And, of course, neither Orb nor Air Video can play LiveTV from Sage.
I always get my ipad with my iPad case to move around with friends.