I have taken the author's ChiRunning workshop (which was outstanding), and this book details everything he talked about in the workshop, and a lot more on top of that -- plus, I have the book to refer to at my leisure.
The techniques for running the author describes are impeccable, because the physics behind them are impeccable. The discussions, diagrams, and photographs are detailed and specific. The metaphysics... they work for the author, and if they work for you, so much the better, but even if they don't, the material in the book will be directly applicable to any fitness runner, racer, triathlete, or sportsperson.
When I started doing ChiRunning I acheived *faster*, *easier* running, lower incidence of soreness and no incidence of injury, and feeling better during and after runs. I cannot expect more from a book on running, and have gotten *less*, from several books.