I picked these books up because I loved the movies so much, and it turns out they’re really much more worthwhile than the films. Don't get me wrong - the movies are fantastic and entertaining and interesting, but like most movies-based-on-books, they just fall a little short.
The books have a lot of interesting themes, and in general are much more thought-provoking and philosophical than the Nightwatch and Daywatch movies. The plot is fairly similar for the first book, then diverges quite a lot for the next 3 books. I’m definitely looking forward to Final Watch coming out this summer.
Bottom Line: Read ‘em and weep. (That's a good thing, right?)