A good book. It has an almost dreamlike quality to the writing.
It is a noir with a subtle comedic element to it. It is not much like the movie adaptation; Blade Runner. I don't think it was a mistake for the filmmakers to depart from the book so much, because I think that it would have made a poor movie, if it had been adapted in a more straight forward manner.
Dick throws ideas all over the place and his psychology is not offensively simple minded unlike most American science fiction. I'm not in love with his prose style, but he is definitely one of the most important SF writers and he has a unique approach.
Deserves to be a classic, although it has lots of problems. For instance, I'm not convinced it makes much sense, but that's not really the point.