I don't review many movies, but this one blew me away, so I had to put in my 2 cents. I think this is the best reality-exploring, mind-bending, philosophical/psychological thriller since The Matrix. Fans of movies that explore themes of dreaming or alternate realities, such as Waking Life, Vanilla Sky, and the Japanese anime film Spirited Away will all love this as well. The cast was excellent, and I personally loved the ending (which I know some people complained about.) You definitely have to pay attention, but its worth it. I feel like this should have done better in the awards season - it's hard to pull something like this off in a way the audience can follow. 5 stars well-earned in my book.