I saw a screening of this at MEC the other night. On the whole a good story, but I have to admit I did get a bit bored. They focused the whole story on a couple of the leaders and a couple of those off the back. Everyone that they focused on dropped out (for various reasons) but two. What really hit home to me was how isolated you are on the course putting in mile after mile just turning the pedals over. No one to talk to, nothing but you, your bike, and the trail/road. The eventual winner really likes the solitude this offers; an escape from the world. Those further back have a lot of difficulty with it. It is this internal mental desolation that causes a lot of them to crack. Of course they all develop overuse injuries pretty fast, but it's the psychological head games they play with themselves that push them over the edge.
I learned that I don't ever want to suffer that much on a bike. Even if it would be a life changing ride. I've had my share of life changing events (including a ride or two), I'll stick to learning to DJ and racing Super Ds.