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

[EX Q]: I was surprised to see that the item was used. Advertised as new. Would have liked the new ones stead got used.
[EX A]: Negative

[EX Q]: Although this is a wonderful working power adapter, I don't believe it is the Macally Adapter that was advertised. I am however happy with it and would shop with this vendor again.Thank you.
[EX A]: Positive

[EX Q]: It looks good, but we never had carbon monoxide in our place yet, so we can't tell if it works or not. The red light is on when we plug it in. And it works when we press the test button.
[EX A]:
Positive