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

I am a hard-core witch who knows the subject matter. THIS book has passed ALL my fact 'checks' that I use with such formula/recipe style of books, to see if I'm dealing with somebody knowledgeable or another ignorant 'fluff & light' offering. Finally somebody who actually knows what they are talking about! Well worth the price, IMO.