I read the book. It was one of those "lose sleep must read more" kind of books. Very well written, plenty of tasty science stuff to make it hard science fiction, not fantasy.
I took my wife to the movie Saturday and it was money well spent, thoroughly enjoyable.
Of course the book was better. Partly because there was more of it, things that portrayed the boredom he would feel and the desolation, and the loneliness. You can only do so much in a 2 hour movie. The book had enough material to have been a 1 hour, 40 installment TV series, but a lot of it would have been him just driving, and recharging, and eating, and driving, and recharging....ad infinitum.
Go see the movie, you will be entertained, take your kids that are over 12 or so, there is some swearing, but maybe, just maybe one of them will be inspired. That my friends, is what Hard Science Fiction is all about.