Two of the best MMA books out there right now in the autobiography category are Georges St-Pierre's book The Way of The Fight and Urijah Faber's book The Laws of the Ring.
The two things that both of these books have in common which make them great is they are not just books summarizing events of their life, but also give very useful advice for life to readers.
In Faber's book he talks mostly about one thing: passion. He talks about how he created a life based on incorporating his passion into every area of his life and that the readers can do absolutely the same. He outlines some basic steps and gives a lot of motivation and inspiration and encouragement to readers to find a passion and incorporate it into their lives, and eventually that passion will fund their life with income. Faber is a highly positive person and you can feel that energy throughout the book.
GSP's book is great because it goes into things like psychology, learning about fear and how it can be used as an advantage, and touches on interesting subjects on evolution. All of these topics are addressed by Pierre well through his co-writer, and they are all geared to help the reader improve their lives. The book is very well written, and obviously Pierre isn't the one constructing these sentences in his second language of English, but you can tell that the essence of what is being said is coming from him and you value that information tremendously because he has become one of the greatest fighters ever. He gives some great tools and ideas to replicate his greatness by getting into his mind.
Urijah Faber Quotes