I watched this movie twice and would definitely watch it again! If you've read the books, you'll love it. They changed things, but that's normal for a movie adaptation. But most stayed extremely close to the book, i loved it! MUCH better than Twilight was. Now, if you didn't read the books, it's still an amazingly exceptional movie, nothing like i've seen for a while. The first time I watched it, I hadn't read the books, but it still blew my mind. I was speechless when I realized it was 2 and a half hours long, because it didn't feel like it at all. You need to watch this movie!!
I do not, however, recommend this movie for the younger audiences. Should be at least 12 to view, considering the gore and overall message of war and bloodlust.