Thanks for posting your experiences.

I think, and I can't really speak for the tech support on the phone, is that you will get 5.1 surround sound "where available" if it is being broadcasted.

Not every network offers 5.1 surround sound, and not every affiliate broadcasts it. And not every show offers it, either. If the show isn't filed in 5.1, unless it is mastered later, it won't be broadcast that way either. If it IS filmed in 5.1, and broadcast in 5.1, you should be able to get that 5.1 surround sound in all of your speakers.

Does that help?