It's a very good, easy to read book.
It's one of those books that is written in a way that you feel like the author is sitting across the table from you, sipping a coffee, chatting with you. (Johnny Cash's Autobiography was the same)
He doesn't focus upon his time in the motorcycle club; he mentions it, but doesn't spotlight it. (Apparently, he'd already dealt with it in print, in a previous book)
He does concentrate on The Motorcycle. How it works, how it started, when he started riding. He talks about what to look for in a used motorcycle, what to be wary of in motorcycle shops, and (finally) how to ride, and advanced riding techniques.
It's interesting in a different manner than "Proficient Motorcycling ..." by David L. Hough. Sonny Barger can tell interesting bits of data about his history with motorcycles.
He also has a suggestion list in the back of the book: suggesting various places he does and has done business with that he enjoyed. Places to buy seats, frames, engines, lights, accessories, etc.