Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Surprisingly comfortable for the price

I bought this for my brother and his girlfriend when they came to visit. I have a guest bed, but it was being used by my other brother and sister-in-law, so decided to buy an air mattress. I was hesitant to buy this one, since it is so cheap and I've mostly had bad experiences with air mattresses. This one, however, was surprisingly comfortable. I'm pretty sure I could sleep on it for a week without too many issues. It actually remained inflated without the need of a refill for several days. I have been on more comfortable air-mattresses, but I'd say this is by far the most comfortable $20 air mattress you'll find.