Okay, first off, I have never seen the movie, so I have no real opinion on a comparison between the two.
That said, I love the book.
It's cute and funny and fun and just all over really entertaining.
If you haven't read it yet, you are totally missing out.
I really need to read the rest of them.
Boo and Mister have both read it also, and seemed to enjoy it, though only Boo has read further books.