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

Input: Consider Input: Haven't had an opportunity to use them yet, but after examining them they appear to be a quality product , I'm sure they will be just fine and work as expected.

Output: Positive

Input: Consider Input: Needed place for kids to sleep while visiting grandma and now they argue over who gets to sleep on the air mattress. Both think it's more comfy than their bed at home.Would have given 5 stars, but the bag it comes with to put it in is worthless, no chance of ever getting it in there again.

Output: Positive

Input: Consider Input: A good book for Audi owners, and fans in general.The book dosen't just focus on the quattro itself, but the surrounding models as well.Not too much of a technical book, but more of an enthusiasts read.
Output: Positive