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

Example Input: I've owned this CD for a few years, yet thought something was slightly off, so I compared "Keep A Knockin" to another copy I have.Results:Original is 168 beats per minutes, while this version is 172 beats per minute.Original's time is 2 min. 23 seconds; this version is 2:16 min.
Example Output: Negative

Example Input: 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.
Example Output: Negative

Example Input: I'm a 100% satisfied with the Squeem Magical Lingerie Shapewear. It delivers what it promises, everything that describes the product it's true. It reduces about 2 inches instantly, it hardly shows with thin clothes, it doesn't let me eat a lot and I feel full the rest of the day, It recommends to wear it about 8 hours but I can even sleep with it, the only thing is that I get marks like when wearing thigh socks, it gives me a smaller waist than what the picture shows, and it's the perfect length for my core.I'm 5'3, I tried another brand before but it was too long for me, I could feel the wires poking specially when bending down. I recommend to measure yourself before ordering any brand.Once I get used to this one, I'm planning to order the "Extra firm compression". It gives more back support and it will reduce the waist even more!
Example Output:
Positive