I liked the premise, but felt disappointed in the end. The story could've been done a lot better; there were too many plotholes and questions for me to fully enjoy this.
This is honestly one of the most exhilarating films I've seen in a long time. Words can't even do this justice, you need to go and see it for yourselves. Just truly amazing stuff, from the quality of the acting to the way it's been shot and edited. I'd love to see this do well at the Oscars.