A big question for me when buying my first book on training for racing, was "Who provides the most reliable and important information?" I have seen Dr. Burke quoted in a variety of sources including Bicycling magazine, Velo magazine, and Chris Carmichael's web site. So I had the impression he is respected in the sport. Further, when reading his writings in other sources, he has gone into the underlying physiological processes that contribute to one's performance on a bike. As such, I decided to purchase his book based on his apparent credibility and the depth of information he provides. Strengths of his book include its excellent coverage of what goes into training for competitive cycling. From beginning "base training" to sprint training, periodization, and planning one's training for the entire year. He also speaks at length on nutrition, equipment/rider aerodynamics, body positioning on the bike, and adjunct training methods. Again, there is an emphasis on underlying physiological processes including some discussion of relevant research. I would say the book's weaknesses lie with it's failure to address racing tactics. Certainly, you learn about what is happening with the body at race pace, but this book will not tell you about positioning for a sprint or pacing one's self for a time trial.
In short, buy this book if you are serious about racing and want to enhance your knowledge of what goes into training for competition. Don't buy this book if you want to learn about tactics.