I bought the book, my opinion is it is a lot more than a coffee table book. It would be easy to criticise as on first inspection it contains much of what I already knew. The strength of the book is not in giving great insight into unknown mystic practice, but in giving clear focus on what fundamentals should be worked on and clear direction as to what good looks like. If you were lucky enough to be coached properly from the start and enjoyed good coaching to keep you on the straight and narrow through your development then you probably need to look else where. I was self taught then I had awful advice on the dock from people who could not ski on how to do it wrong. Having personally done this so badly and the wrong way and now having proper instruction and relearning I can see the quality of the book in its distillation to the correct focus. Many times I have struggled with what to focus on before I had an instructor, the book gives some clear direction. I have formed the opinion that if I want to progress I need to go back and focus on the basics, which I am now doing, the book has clear instruction and excellent photographs to illustrate what those basics are and what I should be doing. Filippos skill is in saying less, my instructor also says less.