Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: When I purchased this product, I thought I was getting a good deal because of the cheaper price. However, once I received it, I knew I had made a mistake. I've been using this product for several years now, and I knew just by looking at this one that it wasn't right. The texture was incredibly thin, and the color was much lighter -- something that could only leave me to believe that maybe water had been added to it.Lesson learned -- spend the extra money -- you're paying for quality!
[EX A]: Negative

[EX Q]: The book covers several generations, so with each generation you have to re-learn all the characters. It is difficult to keep track of who's who when every time you get to know the cast, 200 years suddenly pass and we're in the middle of a new crisis. I didn't read the whole series because of this -- it was obnoxious.
[EX A]: Negative

[EX Q]: This is terrific stuff. Southern California is a college with the first or second greatest college football tradition of all times, and this book describes how, after a long layoff, Pete Carroll has returned the Trojans to these previous heights.
[EX A]:
Positive