If it's the same DVR the offer in the Philly area (Motorola DCT6412), it stinks.
The picture quality is horrible & many people (including myself) had problems with the picture freezing frequently. It was tons of fun sitting down to watch a show you recorded only to find that it froze 10 minutes from the end. Motorola may have fixed the freezing, but I had it for two months & they kept promising me a fix was coming so I finally sent it back, cancelled the digital service (required for DVR) since I rarely if ever watch those stations) and built my own.
I get a much better picture (almost indistinguishable from running the line directly into my TV set) with my HTPC running BeyondTV - and better yet, no freezing picture. Plus I'm not shelling out an extra $20 for DVR ($9.95 for the digital package & $9.95 for the DVR). Again if it's like the Philly area's Comcast, you will have to subscribe to the full digital package ($9.95) to add the DVR service, so if you currently have basic cable, you'll be shelling out an extra $20 (plus tax) a month.