strange - for me, both HD and SD content downloads much faster than i can watch it .. i have zero delay between starting the download and being able to watch the program ... a 45 min HD show downloads in around 25-30 mins on my connection ... (12-15 Meg cable connection)
I too have no viewing delays or issues; not when I had 6mbps or now with 8. Could the content be more robust; sure. But considering it is still in it's DirecTV infancy AND that the content still comes via the program providers; I think they are doing a hell of a job. I not a huge fan of PPV or VoD anyway; I can find plenty of content without it; and see it somewhat as a fad thing at this point. MAYBE one day they will do something to change my mind with VoD, but PPV still hasn't after all these years.