Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Waste money

I bought this book few days ago. I finished reading in a day. This book spent most of the time telling stories about gamblers but not the method to win a jackpot. The author does not have much experience in playing jackpot machine, he merely did some interview with real gamblers and casino employee. There is no pictures, no facts or figure to illustrate. In my opinion, It can only be consider as a easy to read book on jackpot. Do not expect to win anything after reading it.