Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Is she really unbiased?

I bought this book with enthusiasm, but when I learned the author has her own line of products I felt like I had totally wasted my money. How can she honestly have an unbiased opinion when she has a real need to knock down other products? I disagree with many of her opinions and I wonder how many times she tried a product or company. For example, she doesn't have a whole lot of positive things to say about Mary Kay, but I wonder how many consultants she went to. I love my consultant and she has never done any of the things mentioned in this book! Maybe the author just had an unfortunate experience that most people won't have. At any rate, I take her "advice" with a grain of salt. I just don't possibly think she can be unbiased while she is selling her own line. Which of her own products does she not like?