This is a really awesome film, but it was almost incomprehensible to me, which didnt' detract from it's enjoyability. You have to have patience to watch this, it's not boring, or slow, but it's not action packed either, there's a lot of Physics theory in this movie that's really hard to grasp, and sometimes you just have no idea what it going on, if you can handle that, see this film.
I couldn't believe this was made for seven grand! As Rashomon said, you do need patience for it. The theories they throw about can call get a bit confusing, but it all pays off in the end. Great writing.