Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good information, mildly irritating tone

You'll find a lot of good information in this book if you can get past the author's mildly irritating tone. He comes off as sort of a jocular, slightly condescending uncle. Although the book's organization is a little odd, I it fairly easy to navigate to the sections I needed to read. There's good information about both drug and non-drug treatments for high blood pressure, as well as a pretty good explanation of exactly what high blood pressure is and what those numbers mean.