Not being a boxing fan at all, I watched Undisputed Truth completely by accident and was taken in by the mix of humility and self-respect this man showed. Since most of my impressions of Mr. Tyson came from media reports, they were sketchy and sensation-filled. This film, however, presented an insightful view of a "rags to riches" and back again story in a way I've never seen done. The narrative style interspersed with photos and video clips made viewing easy and enjoyable. But more than that, Mr. Tyson's open honesty - clearly accepting responsibility for many of his mistakes, while often forgiving others for theirs - gave me a different view of the man than what I'd expected.
It also showed a man, who faltered several times in life but got up and continued on anyway - a valuable lesson for many.
Someone mentioned that it is a picture of a reasonably good man with flaws - I think that is true - and the fact that he is willing to show that openly in the film is what makes it remarkable.
I didn't read the book, but congratulations to all who made the film possible.