Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example is below.
Q: I've read this book with much expectation, it was very boring all through out the book
A: Negative
Rationale: Review writer does not like the book because it was boring, therefore it is a negative review.
Q: I loved the slim design and the USB power so I could power it with my notebook's USB port. The software was an upgrade to the other visioneer scanners I've owned over the years, which is easy to use. However after only a few hundred scans, there's a growing progressive distortion on the left side of images as if blackened, resulting in a very poor scan. I'm throwing it away. Buy something else.
A:
Negative