Thanks for the replies! It's good to know that it works quite well. I'm still not sure I will do it. I like my Dish DVR and I get all the channels I watch in HD including Showtime for $88/month. I would only get a fraction of the HD channels with the cable deal and it would cost more for Showtime plus there's the up front cost of the tuner card.
I'm thinking out loud now.

I may just stick with Dish and pay the extra $35/month for internet separately.
It would be nice if the WMC integration that
Dish was working on would come to light but that does not seem likely at this point.
Media Center DISH Network tuner is on hold indefinitely