I have had their business service for over a year now. Of course I've never gotten close to the speeds they claim... and a tech was supposed to come out again this weeekend to look into that- they pulled a no show.
All in all I hate comcast with a passion, however when the service works, it is good. They don't seem to mind that I run servers which is good...
But I'm with you, DirectTV for the HD TiVo... comcast for data only