I didn't care much for this, it seemed too contrived for a documentary. Also, the filmmakers seemed to steer me towards certain characters, and yet I was completely unsympathetic towards the protagonist because of what they chose to show me of him.
This movie disappointed me because the story and the people were interesting, yet the movie fell flat because of snappy editing that didn't allow the viewer enough time to understand each scene. The developments in the story were glossed over in lieu of showing the men in boxers or other stuff that was incidental to the tale that they were telling.
I'd recommned that you skip this one and just read up on this story.