Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Very, very poor book

This book is unfocused, and what little information there is only describes a simple "two-leg" trading system. The author claims that this system is proven by historical data, but doesn't give this data. A publisher like Wiley should be ashamed to put out such trash by an author who has been sanctioned for scamming investors in the past. For the cliche (but true) trading advice given in the book, you'd be better of just re-reading Market Wizards.