I'm in the minority that thought Moon was overrated (and boring), but I still saw the potential in Duncan. After coming back from this, I'm very eager to see what he comes up with next. As a sidenote, slightly disappointed he didn't take up Nolan's offer for Superman. I can understand the pressure and logistics of going from indie to blockbuster -- but then again Chris did the same.
Anyway, all in all a solid thriller. As a huge sci-fi buff I appreciated injecting originality back into the genre. The concept is easy to understand though it gets a bit more complex later on. Originally, I thought the ending they were seemingly going for was getting too hokey, but thankfully they didn't drop the ball on that. I think I would have much preferred it ended a little bit sooner just for the Shakespearean quasi-poetic-tragedy angle -- but what ultimately happened was also satisfying.
About time Jake starred in a good movie and it's to his credit he carries this entire flick. Supporting cast was solid for however small of a part they played. What I liked most is however repetitive and brief the repeated 8 minutes could have been, everyone stayed on pace and kept it fresh for the 90 minutes I was watching. It was also refreshing that a plot relying on a fairly convoluted concept that raises questions from the beginning, never relegated the film into a video game tutorial (Hi, Inception). I've really gotta congratulate Duncan on a tremendous sophomore effort. He's a natural talent behind the camera, as evidenced by quite a few clever shot compositions and direction. Most of all this was a concept film that could have easily fell apart if just one aspect of the production failed to deliver. Everything hinges on all the small pieces working together perfectly and that's exactly what occurred here.
Solid 8.5 in my book.