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It is very different in places, especially the ending, but it's still quite good. It's just a different sort of good; a slightly happier ending, some simplification in exchange for a bit more comedy and action, and so forth. I'd still recommend it, though if you're getting it on DVD anyway, you might wait a little longer so that your memory of the book isn't going to be so fresh as to constantly make you compare the two. (I saw the movie four or five years after reading the book, so I had conveniently forgotten many details and thus got to be surprised all over again by even some of the parts that are identical between the two. And certainly by the changed parts.)