said by ajwees41:
The only thing use can't get with a third party dvr is ondemand. if your area uses SDV and your third party hardware can support the tuning adapter.
I don't use or need either of those. What I'm talking about is e.g. tivo's MRV or TTG, or for example using an XBMC based DVR. All prohibited on third party DVR's, even though they support these features just fine.
Meanwhile, cox's in house DVR's that support these functions are allowed to use them. But of course, you have to pay out the nose for that. XBMC not only has no monthly fee, but its featureset puts cox's DVR to a rather pitiful shame.