I decided to watch this based on the advertising campaigns I'd seen on TV which made it sound as though it had the potential to be a great film - and it was, for a little while.
The concept of "In time" is essentially that we've obliterated the use of money as the ultimate currency and switched it for time. Now, at the age of 25 our clocks start ticking whilst we stop aging, which sounds great right? We never get old! But there's a catch, once those clocks start to tick we're genetically engineered to only have one years worth of time remaining. This means we have to start earning (or stealing) time.
The aging concept is brilliantly demonstrated a number of times. Our main man, played by Justin Timberlake, lives with his mother who is 50 - except she only looks 25. Things like this can actually seem a bit weird at first but you quickly get used to it. So how do we get time? Well you can use your time to buy things, like coffee or to pay your rent but you can also get some back from other people donating or by working.
What's interesting is that there is still a divide between "rich" and "poor". The richer people have infinite time it would seem, although how they get it isn't always explained. I liked this aspect of the film, who says that one family deserves to live longer than another? Why should one man "time out" to allow another to live? This corrupt balance is explored quite a lot - it is suggested that this is a way of monitoring the population size.
Aside from this, there is actually a plot underneath this unique world - Timberlake's character is accused of murder. I won't say anymore on that because it will inevitably ruin the story but from here we're lead on a race against time and restoration of justice. The only negative I have is, I felt the ending was weak - almost like the writers couldn't think of a plausible way to end it so they came up with the easiest thing.
So would I watch this again? Definitely. Should you watch it? I recommend it. Hope this helps someone.