I am obsessed with the Twilight series, and my biggest compliment to the director and writer of the screenplay is that this movie actually sticks pretty close to the book. It's a huge pet peeve of mine when major details change from book to movie, but this was not the case with Twilight. I read in another post that the movie makes way more sense if you've read the book and I'd have to agree. I think the movie would entertain even a non-series reader, but you get subtle things (i.e. Bella being extremely clumsy through the entire movie, tripping, dropping her bookbag etc) more than someone who is just watching it. I'm very impressed and can't wait for the next film... ;)