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

[EX Q]: My Nomad Jukebox Zen Xtra 40GB only worked for 6 months. I no longer have any sound and the battery doesn't charge. When I called customer service I was given the excuse that it wasn't supposed to be used in the gym. As you all know it is marketed to fulfill your portable music needs. If you can't use it in the gym then it is not truly portable. I know many people who use their ipods in the gym and have had no problems for years. This product has fallen far below my expectations. It is not worth the $300, not to mention the fact that it only has a 90 day warranty. Can you trust a product that is only guaranteed to work for 3 months? No.
[EX A]: Negative

[EX Q]: The sizing of this costume was fairly accurate but it very cheaply made. After only a few wears, the mask and belt both broke. I wouldn't recommend this costume.
[EX A]: Negative

[EX Q]: This books just didn't do it for me. I enjoy PC but this book. Seemed too easy. Things just happend, people just called. In fact, I think this books had some bad editing. I felt as though all what was needed was there, and that someone just yanked out the big sections for no reason.I am still a fan, but this one is a skipper.The doc just happens, to see the resturante that the killer was using.The polices offer in charge is left in the subway with two people who are not police. Just does not at add.
[EX A]:
Negative