This is one of the prettiest books available on the Alexander Technique and is a wonderful place for beginners to start learning about the wide range of activities to which the technique can be applied. It is also a wonderful book to hand to friends and relatives who are completely baffled by one's interest in Alexander Technique. (I often wish that something with a lot of name-recognition, such as yoga, had done as much for me as A.T. It was be easier to explain.)
However, there's more to this book than its large format and wealth of illustrations. The first part of the book is a very useful explanation of muscle function and how we move. I can't speak for others, but I found I was woefully ignorant about my own "physical operations," knowing much more about the brain than I did about how I crossed a room. I'm probably not alone in this and Glynn MacDonald explains it in a way that is both complete and accessible.
There are lot of other great Alexander Technique books, especially Michael Gelb's and Pedro de Alcantara's. And, of course, nothing can take the place of a live workshop and/or lessons with a trained teacher. At the same time, there is a niche for MacDonald's "picture book." I recommend it strongly to anyone with an interest in Alexander Technique and as part of a personal library on A.T.