There is a good mix of sound here, with a great blend of action and ambient noise. The dialogue, which is equally important, also comes across nicely.
The extras are plentiful, and although they might not crack some of the plots most intricate ideas, they still provide some wonderful insight into the movie itself. One of the things offered is "Extraction Mode" which allows the viewer to watch featurettes that detail some of the movies more stunning sequences. There is also a documentary, "Dreams: Cinema of the Subconscious," that stars Joseph Gordon-Levitt and discusses the latest in dream reasearch. At 44 minutes, it is a bit long, however anyone interested in the topic might find it worth a look. There is also the motion comic "Inception: The Cobol Job," (14:33) which details the moments that happen before the beginning of the film. The comic looked great across the screen; almost as beautiful as the movie itself, however, and this may be intentional on the part of the filmmakers, some aspects looked a little too blurry, but it is a minor quibble at such an interesting aspect. Among the rest are Promotional Art, selections from the movie's score, and theatrical trailers.
Inception takes a big gamble, but pays off in a big way. This has got to be, hands down, one of the best movies I have every seen, and a definite addition to anyone's Blu-ray collection.