Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointing...

It just goes to show... yes, anyone can publish and sell a book, even if it's unorganized and full of repetitive, outdated, and technically incorrect/incomplete information (for example, why would anyone want to zip a PDF file--they're already compressed!). This book is a loose collection of articles; a few actually offer worthwhile information, but most are completely useless.