Instruct: Classify Amazon reviews into positive or negative sentiment
Query: In hindsight, not great advice

Hindsight is 20/20 and all, so this may sound like a cheap shot, but the people who wrote and promoted this book (NAR economist, Fannie Mae executive) had a strong incentive either to lie or to believe their own BS. Caveat emptor. They had no idea what they were talking about. Remember that in the future. They get paid a great deal of money to pretend they know what they're talking about, but they actually do not.