I own a challenging horse, and have tried many different systems of ground work with her - Parelli, Lyons, Centered Riding, etc. All of them had some effect, but none have really changed her exciteable nature and dominant attitude.
After using some of the exercises in Dancing With Horses, my mare has a totally different attitude. She is much more submissive, much more trusting. It is remarkable.
The book is visually beautiful. The photographs are very helpful in demonstrating the exercises, and are very pretty. The instructions in the text are clear. The horses - and the author - are very handsome, so there are aesthetic benefits as well.
The author describes a certain exercise, and says it will have a profound effect on the horse. I'm accustomed to marketing hyperbole, so I read it, but took it with a grain of salt. And what he wrote was true. Doing that one exercise made an immediate difference in my horse's attitude.
I can't say enough good things about this book. I hope you'll buy it and reap the benefits.