My first impression was one of disappointment. I had anticipated a book demonstrating the hyung patterns, rather than a book demonstrating the various techniques applied in them.
Once I was over that first batch of disappointment, however, I came to appreciate the book for what it is worth -- a good book on illustrating ITK moves. I liked the way the photographies are handled, with overhead views as well as side-views.
It was not what I was looking for, but a good book never the less. I recommend it.