I don't really have any huge nagging 'problems' with the book.
I think the best way to study it is to say to yourself, "Okay, I'm going to trust the info in this book for X weeks/months/years and see where it takes my game." Many people try a new method or system and don't fully commit to it, instead trying to use it as a bridge between their old (faulty) stroke pattern and their desired new one. That simply won't work. With anything new, you have to fully trust it to get any benefit.
That's what I did with the book about 5 years ago. My game improved and that was that.