A well done sci-fi movie, it's like a Robert Charles Wilson book (particularly The Spin Trilogy) on the large canvas. It has some slowdowns and logical errors but the last hour is a thrilling space adventure.
The end could be a little longer, more detailed, but it is far better than most of the sci-fi movies with an ending left open to imagination (which I always hate in a story). And that's because this movie has a satisfying ending!
It's a must see for hardcore sci-fi fans (obviously in IMAX), way better than Gravity.