Before I get into it, its important to note that this mattress isn't meant to be slept on every day. By day 3, air has escaped, the sheets won't stay, and getting comfortable will be easier to do on the floor. But for one or two nights, your guests will sleep well. Comfort When filled up with enough air, this is quite comfortable. You will need sheets and a comforter to get the most out of it. Support Its full of air. You must have realistic expectations for the support it can provide you. I wouldnt put anyone with a back condition on any air mattress. Firmness This again depends on you and how much air you fill it with. Some air will escape, but it's it noticeable until after the second nights sleep. Durability My toddler jumped on it and it's still alive! I wouldn't sit on it with scissors in your pocket though.