There is quite a lot of purposeful, useful information here that made the book worth reading. What I found less compelling was the approximately 30% - late on - which was a mix of autobiography ( some would empathise and take encouragement perhaps from comparing their own journey with John's) and a personal demolition of (whose? American? Worldwide? ) systems of Education that, lacking anything other than assertion and anecdotal references neither moved the essential agenda forward at all ("How to Make A Great Living ....." nor did it have anything of substance that might persuade a trained/qualified teacher (Me?) of anything not self-evident nor universally relevant to the readership which, given the title of the book, might well comprehend a significant number of highly-experienced teachers! When pointing to specific resources and advising a tested methodology, the book is very helpful. There is also a quantity of "filling" and repetition that becomes rather tedious after a while so some tastes might come to the view that the "Meat" might have been served better had the excess fat been trimmed away thus reducing a banquet to a swift and satisfying lunch.
There are maybe some hints here and there that John feels that success is related to the quantity of published materials and that quality is less important. His own experience asserts this is true but, as a teacher, I am wrestling with this concept. I am persuaded from his own success that this is true but I wish it were not and am left wondering how far to compromise. This is, of course, a personal and an Englishman's view of a book that others may find very compelling. I am glad I read it on my I-Pad!
Bring out the slimmed-down, more focused version, John and IMHO you have a potential winner!