Saw it last night, this movie was AWESOME! Very detailed, you won't want to go take a bathroom break in the middle of this one.
I would agree with some of the other posters in that it is similar to Matrix or Momento in that you kind of don't really know everything that's going on until the end, but it was very well done in the sense that it all came together in the end without alot of really confusing questions.
Leonardo has really grown on me, from someone I couldn't stand over the whole Turdtanic affair, into an actor I respect for his acting talent (see Shutter Island, Body of Lies).
Defintely worth the price of admission, you won't be sorry you went to this one...