It's been interesting having read all 5 books and seen the first 2 HP films. I'm frankly impressed with how the production crew and directors managed to maintain its core of the storyline in the book and captured on film. Sure there were quite a few changes, but done well to change over to the next scene without much confusion.
I certainly am looking forward to seeing the Prisoner of Azkaban film. Hope it'll be just as good as the last 2. Here's hoping.

The trailer does make it look great...I'm just hoping it's as good as it's showing in trailers.