Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Mischievingly over[priced

The quality of book both in content and presentation is low. The writer introduces his recommended technique and then explains some of his experiences and some historical view but without even trying to reason why it happens what happens or to generalize it - what the reader learns is just an opinion that could be heard anywhere from anyone without any sensible support for it. The presentation is also very low quality. It is more like the book is a photocopy of a hand script or something. Bottom line, doesn't worth a penny.