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: This product worked just as advertised. Inflated in less than 3 minutes, and after testing for 2 weeks, remains inflated with just minor refill of air required. Great value for the price. Highly recommended.
Solution:
Positive