Instruct: Classify the given Amazon review as either positive or negative.
Query: Durable but firm

I bought this bed because I was having company for Christmas. My family stayed for 11 days and the bed held up very well. It is very simple to inflate....you just turn the "inflate" knobs and you're all set. I have yet to deflate it since they have left but I don't think it will be a problem. It lost some air each night but I would simply turn the "inflate" knob(s) for a few minutes and it was back up. My guests complained about the bed being too firm and had subsequent back pain and so that is why I gave it four stars. Otherwise a durable and sturdy bed.