This movie really is difficult. Not only to describe (it is far too complex for it's own good/commercial success), but also to watch and follow the plot. While there have been other movies who played with the time factor (and/or other stuff, which I won't say anything about here, so it won't spoil anything for you), not many refused to explain themselves to you.
In other words: While many other movies with the same or similar theme, show you the same scenes twice (or maybe even more often), this movie does not give you this luxury. You have to stay focused to get it. Of course the main plot and the big details will be easy to grab. But again, only if you let yourself into the movie. But this movie allows you to watch it a few times and catch nuances, small things, you might not have seen/understood, the previous time(s) you watched the movie. A complex, but rewarding viewing experience then
In other words: While many other movies with the same or similar theme, show you the same scenes twice (or maybe even more often), this movie does not give you this luxury. You have to stay focused to get it. Of course the main plot and the big details will be easy to grab. But again, only if you let yourself into the movie. But this movie allows you to watch it a few times and catch nuances, small things, you might not have seen/understood, the previous time(s) you watched the movie. A complex, but rewarding viewing experience then