Yay! Our Comcast HD DVR finally got the software update (see my previous post here).
I had a quick look at the new UI this morning, and it looks pretty slick. The response time is definitely better, and the interface is much mroe intuitive.
I'll have to see whether the box still reboots randomly (some discussion at work indicates that you can swap out the DVR box for a newer model for free, and the new models are a lot more robust). Hopefully that won't be needed though (I'd lose all my recorded shows! sob!)
My only niggle so far is the new Search functionality under the main menu. The way you enter program titles is a bit odd, and it's harder to find results. (I tried searching for "Hell's Kitchen" and it took ages to find it...)