Instruct: Classify Amazon reviews into positive or negative sentiment
Query: waste of time and money

Someone , in his review, said that 50% was useless and another reader added that "I wouldn't buy it with my money": I disagee: 99% of the book is utterly useless and would noy buy it with my worst enemy's money. I'd rather spend it on something else.I saw that there is a new edition: Please do yourself a favor: DO NOT BUY IT!