After ‘Sixth Sense’ this was the one where the ending caught me by surprise and I found myself grinning. Any movie that leaves enough material to chew, so that even after you come out of the theater one is still trying to figure the different images, situations that one saw, is a good movie. Sometimes one is even incentivized enough to go see it all over again just to get some facts rights is great for the box-office.
Science fiction movies, from Hollywood, of course are mostly morbid and dark, but this has a feel good and happy ending which makes it a great watch. I recommend.