Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: I noticed a few reviews complaining about their extension cords breaking down after just few months of usage, so I decided to let you all know that after nearly THREE years of use, mine works just as good as it did on day 1. It was cheap, does what it's supposed to, and hasn't failed me yet. Buy with confidence!
Solution:
Positive