I bought this book when I was training in the Aikikai style of Aikido, and it didn't make sense. Everything was quite different from what I have been taught.
Now I train in the Yoshinkan style of Aikido (which is much more structured and logical, in my opinion), and I rediscovered this book, which now makes perfect sense.
I think the book should state more clearly that it is relevant only for one particular style of Aikido, otherwise it's misleading.
The book is good as a reference and, accordingly, is very technical. If you are interested in reading more about the principles of Aikido or about its philosophy, then this book is not for you!