As a recent convert to Dish, I have found their HD and system to be faster and better than DTV. What I also found is that it is raining outside now and I have no signal, it was rare I would lose my DTV signal, and never for just a rainstorm. It's a good thing we have Comcast as a backup. since we use it for HSI. So Dish flunks the weather test, but when it is clear the PQ is way better.
Also a feature I really like is that when I watch HD the output is set to normal 720p. When I swap the tuner and watch SD it remembers to set it in stretch mode, the way I watch SD. Nice.