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

I bought this air bed to accommodate a 120 lb. guest who used it for five days. The initial fill took only a few minutes. It was really convenient. It needed only 5-10 seconds of re-inflation after 3 days to make up for lost air. Even so, we weren't sure if the bed had lost any air at all. This mattress has remained inflated for 3 weeks now without losing air as far as I can tell. I'm happy with my purchase -- it does its job.
Positive