I got mine from Amazon ($169) on Thursday. I finally got it working fully today, with some caviats.
There is a big learning curve with this thing, and the doc is really skimpy. Thank heavens for the Silicon Dust support forum, and the Tivo cable card forums. Without them you will never get this thing to work.
What they don't tell you - the cable card only works properly with Windows Media Center on Windows 7. You won't get the subscription channels with Beyond TV, and you won't get HBO/Showtime/Max with the preview TV app, or MCE under Vista. Vista is not cable card ready, and Digital Cable Advisor is not available for it. I had a hard time even getting Digital Cable Advisor for the Win 7 system - a forum posting had a link that downloaded it and installed it from MSoft or somewhere.
I had to call Comcast twice to get all the channels working. The first call was to the special national activation hotline that I had to find in a support forum. They got the card activated, but I could not get ESPN, or anything other than the basic basic channels. I called again to get the other channels activated. ESPN, et al, now came in, but not HBO and company.
I finally found that the Setup on my Windows 7 system was set up for Beyond TV. I changed it over to Windows Media Center, and HBO, etc. finally came in with MCE on Windows 7. They still don't work with the HD Homerun Quick TV app.
Windows 7 is running on my older PC, that does not have HDMI. I can't find a way to play the WTV files on my Vista system that does have an HDMI connection to my HDTV. Looks like I will have to upgrade to Win 7 on the new system, and get an HDMI card for my old PC to get everything working.
This is a nice device for people who like to drill down and solve problems. I probably wouldn't recommend it for the faint of heart or the non-technical.