Warning: Any forthcoming review is resultant from necessary tidying of read and as of yet not reviewed books.
Basically this is every bit as good as the film. I suspect that the brilliance of the film may have altered some perspectives of this as a work of fiction but the book was the original. And the film basically sticks identically to the book. I know the fact that the title includes both 'Princess' and 'Bride' may also have discouraged some potential readers. However it's a trap. The book focuses more on comedy, action and some of the best lines ever.
Go see the film, read the book and next time someone uses the word 'inconceivable' I believe you'll never see the word the same. It's a masterpiece in my mind and will likely become a fully fledged classic in years to come if it isn't already.