OK but not as good as Derek Piggotts Book
I have seen a review where this book was compared to Beginning Gliding By Derek Piggott and the reviewer felt this book was better - I disagree.
This book is useful, and I would recommend it; it does have more colourful and up-to-date diagrams, however D Piggotts book goes into MUCH more detail and is the kind of book you can read again and again and as you progress get more and more out of it.
I am just learning to glide, I've had 15 lessons, not yet solo, so that will explain to oyu where I'm at in my gliding progress.