Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A *COMPLETE* waste of money ... What a ripoff!

This was the worst waste of money I ever spent. All of the short, simple "tips" are self-explanatory; I can't even imagine anyone over the age of 9 not already knowing them. Unless you spend most of your spare time mugging people, I can't imagine that it would add anything to your life. I would very strongly suggest that you save your money and skip this one. YUCK!