According to this thread on AVS forum, Comcast plans on beta testing their HD DVR with TiVo software next month! This could just be a rumor but it sounds legit since the Comcast TiVo deal has been in the open for quite some time now.
If anybody gets their hands on a Comcast TiVo DVR, I would love to hear about it. I’m not a Comcast user but, I’m sure there are a lot of people who would be interested in getting more information.
Thanks Mike!

Matt –
What is your location?
Jeff
had Comcast install Tivo software over the weekend, Techs were very good, but still took several days to figure it out. My screen would keep losing video signal, that problem is still ongoing, I think the box is now heating up since the new Tivo install, swapped out boxes with same results. Ive been around Tivo for many years, 9 years with Directv before jumping back to cable, comparing Tivo services, comcast version is lacking alot, stuck with 1 type of guide menu, software is very slow,it looks alot the the Tivo of old, but its a distant second for now. I replaced the Tivo box twice and now at the point of removing all Comcast Tivo’s from the home, lost video signal twice during the pats game and had several viewers scrambling to the kitchen to watch the game on a 12 inch tv, while the 15 minute reboot was going on. i will agree, its a step in the right direction, I just got in too early and it’s obvious that they did not learn too much from the beta release, because after spending 2 days at my home , they still left scratching there heads..
and FYI, I live in the southcoast region of Mass, New Bedford/Fall River area..
Just had the comcast/Tivo box installed a few weeks ago. Pretty happy with it so far. You can read my full review on my blog here:
http://comcastenthusiast.blogspot.com/2008/01/comcast-and-tivo.html
I have had the new TiVo installed for four days now, after jumping back to Comcast from DirecTV. I have been using a Phillips TiVo on DirecTV for years now, so the that was why I chose TiVo over their own POS DVR. Anyway, I am totally frustrated. Not only are there far fewer features than my really old low def TiVo (upgraded over the years), but it locks up constantly. Now this wonderful TiVo is unable to figure out how to record anything, almost like it forgot that it has a hard drive. They have sent the software three times in four days, each time blowing away any settings, wishlists and recordings I have done. THIS THING IS GARBAGE!!!
I hated the DirecTV HD DVR as well, with it never working right, and now I hate the Comcast HD DVR/TiVo running on a Motorola DCH3416. Is it that hard to record things in high definition? My low definition true TiVo on a Phillips box always ran like a champ so why are companies trying to run TiVo software in emulation mode?
I live in Massachusetts and recently got the comcast Dvr with tivo software. I’m on my third box and I wish I purchased a TIVO box. The software is buggy and very slow. Comcast service is good but the equipment sucks.