We have enjoyed our Coleman air mattresses, although the first one needed to be replaced after developing a leak. Overall, they are very comfortable, and as long as they don't leak, can be used for quite a long time. Firmness As long as there is no leak, these mattresses can be plenty firm and comfortable to sleep on all through the night. Durability We received a Coleman air mattress for our wedding, and we ended up needing to sleep on it for a couple months because the delivery of our regular bed ended up being extremely delayed. Sleeping on this mattress every night for about a month and a half, it worked great. It stayed firm and we never had to pump it up, even to add a little air. But a week or two before our bed came, it began to leak slowly. It would be half flat by morning, and we never could find the leak. Even with careful searching, we were not able to fix it, and we have since needed to replace it. We have only used our second one for some camping trips, and so far it has held up great.