Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Buyer Beware!

Phil Elmore is widely known as a hack when it comes to martial arts. Before you buy this book, I suggest you do some research on the author at Wikipedia or your favorite search engine.While I think in general knowing a little self defense is important, learning it from this book is likely to get you hurt or killed. Should you actually need to defend yourself, the training offered in this book is of little to no value when it comes to fighting or self-defense...but looks really cool showing off to friends who don't know any better.In today's litigious society, I wouldnt be surprised if someone actually tried these techniques in a real-world application, got hurt..and sued Mr. Elmore.Mr. Elmore should actually learn how to fight, and show that his techniques will work before anyone will take him seriously.I won't comment on the section about homeless people, as it has absolutely nothing to do with self defense...merely Mr. Elmore attempting some sort of social commentary.