I read this while waiting at the bone marrow section in hematology lab while doing my industrial training. I was that bored, got told off by a lab technician because I read this book and etc. Finished it in one day. 
 I watched to movie first and then the book. I didn't like the movie (Robert kept running here and there and Ewan McGregor is.. mmm) but the book instead was impressive. It was so dark and gloomy, investigative, suspenseful, controversial, intellectually challenging and most of all, Dan Brown isn't afraid at all as some elements are very blasphemous and almost like the modern version of Showtimes' The Borgias. 
 Fast paced, moderately lengthy and good plot twits. Its easily a good done from Dan Brown. 
 However, some of the facts has questionable tendency. But its fiction, no one really cares.