Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Has this guy worked in the industry?

I have been working in the printing industry for many years. I can tell when someone has actually worked in the industry or just teaches the subject. This book has many flaws due to the author only having classroom knowledge on the subject. I brought this book to my employees and we found ourselves laughing out loud. This book spends too much time on small details about paper and printing that are never used. It simply makes the subject harder than it actually is. The book seems like it was just thrown together with poor quality black and white photos used as illustrations. I found words in bold print with little or no definitions next to them and could not be found in the glossary as well. I bet that the only place you would find this book being tought is in the author's classroom.