Definition: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: We purchased 2 of these for guests' use and they are quite comfortable. The pumps work relatively quickly and quietly, and allow for good firmness in the mattress. They also held air well and needed little additions over 2 weeks' time.Our only drawback was that the air doesn't provide insulation from cooler ambient air. We keep our home cooler at night, and a guest found it necessary to cover the mattress with a heavy blanket to insulate properly from the coolness. I would recommend a mattress pad or foam topper when using this to provide some extra warmth.
Output:
Positive