Saw this last night and enjoyed it very much.
Interesting story that made a change from the usual paint-by-numbers Hollywood sci-fi affairs we are use to.
I liked the directors vision of the future, it was well executed and felt very realistic. Can't believe some people are moaning about it not being futuristic enough, if you want flying cars and laser beams then maybe rubbish like Total Recall re-make is more up your street.
The whole mechanics of time travel can become a total mind f*** if you think about them too much so better to just switch off those thoughts and enjoy the film for what it is, a well made piece of sci-fi.
I would say a 4 out of 5, not as mind blowing as the Matrix but still one of my fav films of the year.