said by kb1:I'll add one more thing. The OD HD picture quality is not as good as the linear channel.
Not always, especially with local channels. Some here in Chicago, particularly WLS (ABC) and WTTW (PBS) are severely compressed. The OnDemand copies often look better. The same goes even for the SD version of some channels. Not to mention that some channels offer HD versions OnDemand, even when we don't have the HD channel itself (FXX and Smithsonian for instance.)