For someone who brings nothing more than enthusiasm to the art of motorcycle riding (in other words, you don't know the first thing about motorcycle parts and you have no idea what "countersteering" means), this book is a fairly good introduction. The author takes you through all aspects of motorcycle ownership, from deciding whether riding is right for you to the mechanics behind the combustible engine to making high speed turns. The information is reasonably detailed and well written, and all topics are covered.
My only complaints are: 1) many introductory books to motorcycles, such as The Idiot's Guide, give a more detailed breakdown of all bikes currently on the market... this book only covers a handful of bikes available (although it does have a section on used bikes), 2) there could have been more illustrations to accompany the explanations of motorcycle parts and functionality, and 3) certain sections use terms that the author never takes the time to define (at one point he makes numerous references to the "gasket" without telling the uninitiated where a gasket is, what it looks like, what it's function is, etc.).
But in the long run, my complaints are minor. This book is relatively comprehensive, and covers some issues that other books don't (such as the section on female riders). The author is well informed, clearly cares a great deal about the subject matter, and stresses safety. Anyone who is considering buying their first motorcycle would do well to buy this book (and maybe one or two others as well).