I've read the book, haven't watched the pilot yet; but I've heard that it's fantastic. The book is phenomenal, one of Dick's most highly regarded works. It was a hit when it was released too, if I'm not mistaken. Lots of cool stuff going on regarding simulacra, the ephemeral concept of "the original," and thus the ambiguous question of history in general. There's also a very humorous depiction (in my opinion) of a John Galt type character. Really good book. Is the Black Mirror Christmas special on Netflix yet???