I just got a HD Homerun Prime during black Friday and have had it running for almost a month now on Comcast in Portland Oregon here. I use Windows Media Center and it works great. I got lucky at my local office as they gave me a M card and self install kit without any issues though she did say it would cost a extra 8.95 a month for the card even though I've heard first card is supposed to be free. I installed the drivers and stuff from the disk, it self updated to the latest ones and updated the firmware as well. I had to redo some of the media center crap I disabled due to never needing to use it so not wanting to have it taking up valuable resources.
I called their 800 number, told the gal what I needed, and she activated the card without issues in like 5 minutes and was very helpful and nice, just like the lady at the office was.
Once I had everything back up and running the card populated the guide and all my HD and movie channels showed up, before everything was up it just showed the first 39 channels, after, everything worked.
Any of the normal HD channels are copy freely so you can convert and edit them to your hearts content, the one movie channel I have is copy once so you cant edit or do anything with those except watch them on the original machine that did the capture.
You HAVE to use media center or myth TV because of the DRM involved, my copy of CWEPG recognizes the card and can do some QAM channels with 2 of the three tuners, none of the extra HD channels except locals, plus it uses the RF channels and not the virtual numbers the cable co assigns to them.
I have figured out how to make WMC use the file names I want now so been using it a lot to capture season passes and individual programs and then redoing the captures to something my media players can see and watching them after editing on the network to the TV in the front room.
The tuners seem to be much better then the one in my Divco Fusion3 gold with a good LG HD tuner chip. I get better bitrates on my captures now and less errors then before. The gal at my office did say that she might be wrong about the 8.95 a month rental charge for the card seeing how I brought up that I had heard first card is free and was going to research it more after we left and she had free time. If she turns out to be wrong there will not be the extra charge on my bill so we'll see next month.
I do have a nice Motorola HD box with every output known to man on it and that one is not costing me anything and I don't have to return it.