I definitely recommend it, you should watch it. It covers some interesting ideas about the (ir)reversibility of our actions, free will, time, cause and effect, etc.

It has something in common with 'Minority Report', it also shares some elements with the story 'The end of eternity' (by Asimov).

I also have to add that (if I ignore the technical aspects :-), this is one of the few movies where they haven't screwed things up illustrating things that are not natural to our world, or things that are not synchronized with other scenes in the movie.

A must see. I insist.

Enjoy!