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

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
When I am in need of a product I spend a lot of time doing research. Not only are the costs of the product and shipping/handling charges important but also the speed, accuracy and dependability of the company/person involved. I highly recommend this source to be checked out when searching for specific products.
Answer:
Positive