Luckily, I got this book from the library before buying it. I own a bike that is about 4 years old (2000 model). This book is dedicated to all brand-new top of the line parts and bikes. When I bought my bike, it was still in the $800-$900 range. Not completely top of the line, but good components. Nothing in this book helped me with the maintenance of them.
Bottom line... if you have a brand new bike that has top of the line components, buy this book. If you are like most people who can't afford $2000+ bikes and want to do their own maintenance, buy "Zinn and The Art of Mountain Bike Maintenance" by Lennard Zinn. You won't regret it!