I think it must be very difficult to force almost 600 pages of book into two hours. I thought the changes they made to the story were good and necessary for the story to progress in that short ammount of time. I think if you haven't read the book, you might not understand all the subtle things that are wonderful about the movie. I would definitely suggest it, but warn that people should not expect to see the book unfold on the screen in the same capacity or timeline.