I read this about a year ago and took a lot from it - in conjunction with watching Tom Saguaro, Eric Cogorno and Jess Phillips on YouTube who all incorporate much, if not all, of the techniques in the book.
There is a great section on diagnosing your swing problems by looking at ball flight and such like. It wants you to be an independent thinker and master your swing rather than just follow (despite it having a set of basic 'rules')
I would recommend this for older players, less flexible players or those whose backs and hips haven't thanked them for their golf swing in the past. I think it fixes many problems of injury in older golfers.
Lastly, I found it didnt really help my distance , but helped my consistency in flight of ball and target.
