The positive is that the method of Jack Nicklaus is clearly explained. It's good for the historical culture ... but nothing more. The strategy game and part personal preparation by cons is fine and helpful. the negative is that it is very disturbing if not impossible to implement when we started differently: with the ball left heel in ALL cases, everything is questioned, and no pro golf practice this method no longer our days (in any case, none that I know of); Therefore: I have to take lessons with my Pro to "reset" my swing after mĂȘtre tried this method, which is expensive in the end.