I purchased 2 twin double high air mattresses to replace a trundle bed in a guest room to create more space. My expectations have been realized. I now have more space in the room, they are convenient and the mattresses are very comfortable. I personally found the latter to be true, as did my 9 year old grandchild as well as adult guests. The mattresses held the air overnight and only needed to be adjusted after a few nights of use.... but only minimally and very easy to do. The key is to make sure that the air valve is pushed in as far as it can go. So far I am very satisfied, and only time will show the durability these mattresses. To save $20 dollars, I purchased one mattress with the air pump and one without.