Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not a helpful or practical golf instruction book

I had read some things about this book over the years, some were positive. Is said to be a "cult" favorite among some tour golfers .I found it completely useless.It is really not a deep examination of golf swing mechanics. Rather, it is an idiosyncratic examination of the golf swing by someone who seemed to have an obsessive personality . The geometric diagrams were impenetrable and obtuse.