This is a book I really liked when I got it last year. First, I'm a management consultant and coach to leaders, and second I regularly practice aikido.
What do the six principles focus on? Self-knowledge, Planning, Habits of Language, Values, Resiliency (dealing with failure), and Control (or lack thereof). I liked the insights and ancedotes in each chapter, and there are some really good exploration exercises spread throughout the book. Do these alone or with a guide; they're great for cultivating reflectiveness. "Think time" is something all leaders need.
The book will appeal to leaders who are intuitive or are exploring that aspect. Linear, hard-driven types--you probably will pass on this one for now. The author's earlier book The Paradox of Success addresses the disillusionment faced by those who have achieved success but at great personal cost. That book will find more resonance with a wider audience.
Aikido is used as a metaphor, and the author shares both his admiration for the art and admits his lack of experience on the mat. The book found it's mark with me. But for those looking for aikido, they should probably go elsewhere (George Leonard or Mitsugi Saotome).