It is a bit different, most notably in the frame story. This is more substantial in the book, with quite a few sarcastic asides from the 'abridger' about the bits he is cutting out. This gives that part of the story a different feel, in some ways much more grown up than the film. The Princess Bride Florrinese adventure story bits are very similar. What we get is a bit more back-story for especially Fezzik and Inigo. I loved the book, but for once I wouldn't say absolutely that it was better than the film. This might be partly because the author of the book also wrote the script for the film.