I saw this a few month ago. Overall, I was pretty impressed (even with the whole Keanu Reeves always being the same character thing going on). I think it's a better book to movie translation than Do Androids Dream of Electric Sheep, but I do for some reason seem to remember a bit of a different focus in the book on the state of mind of the main character (one of the reasons for the title I assumed). It's been a long time though, so my memory could be flawed.
Anyways, I used to be a big Dick fan, and would like to see more movies made of his stuff. Ubik would be great.