Interesting discussion...
I'm switching from cable to E*, installation set for this week. The biggest downer is that my market (Cleveland, OH) has no locals in HD yet. So, I will only be able to record one local in HD at a time.
But, I see a "plus" on the flipside... I can record one HD and two SD locals all at once, for a total of 3! It's unfortunate that I will have to pick and choose which programs I want in HD, but I"m sure in most cases there will be a clear winner.
I also may keep my TiVo series3 for OTA recording, meaning I can record three OTA and two satellite programs at once... Just sounds like a nightmare to manage. I can see my girlfriend asking "Now, do we record Heroes on the TiVo or on the Dish box? Which input is that again? "