Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't forget the DVD

I saw a couple of reviews talk about how they wanted "more" or a "DVD", but there is a DVD based on this book called The Five Keys to Mastery. You can rent it at Netflix or buy it here on Amazon. In fact, I saw the DVD before I bought the book. They complement each other, so highly recommend them both. Good luck.