Overall I enjyoed the movie very much, in fact I'm off to see it a second time today. But I agree that it helps if you read the book for some of the inside jokes and to keep pace with the movie as it is very, very fast moving. I think that it is a lot of material to fit into a 2-hour movie and they did their best (though I would have chosen to exchange a few scenes for others I felt would have been better at explaining the plot. If you are a Twilighter, it is a must see though...but don't expect it to be exactly by the book....!