This movie builds suspense like nothing else on the market. It's slow and purposeful out of the gates, each piece of "night footage" leaving you biting your lip and waiting on something worse...before cutting to the next day. This may aggravate many of the "I want it now" generation, but you'll appreciate that tension when things begin going berserk.
The Exorcist is no longer the scariest movie out there. This movie is what nightmares are made of and it hovers inside your psyche long, long after you've left the theater.