I've read all the books in the Robert Langdon series. This one was one of the easier to read ones but wasn't too high on the suspense. I could see things coming way before they panned out. I figured that would lead to a pretty dull movie. I was wrong. The movie made some tweaks here and there to make it a much more flowable movie and to actually have surprises and what not. Unfortunately, they also changed the ending of the book - which was my favorite part. They made it more of a cut and dry type of situation and lost the philosophical not so happy ending from the book. Regardless - it was a decent watch and I would say it was better than Angels & Demons but not as good as The Da Vinci Code.
I would somewhat recommend people checking this out. It's not bad but it's not a must see by any means. Fans of the book will probably feel the same way that I outlined above.