Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pay money to get cut up

The so called knife defenses in this book are terrible. Tedeschi's other books are fairly good, but this one is the worst of the type I have ever read. The knife work will get you killed. There is no way this stuff would work against anyone with any knife skill whatso-ever. If you have seen Jim Carry's "you've attacked me wrong" skit from 'In Living Color' you have some idea of how useless this book is.The other weapons are ok, but the knife stuff just brings the whole book down to not worth keeping.