A few years ago the heater on my waterbed decided to quit working.  Of course it was winter.  Sleeping on a queen sized ice cube is not a good way to go.  I was out of work so I went looking for solutions.  I had a Montgomery Ward credit card so I decided to start there.  They didn't sell waterbed heaters so I looked at mattresses.  the cheapest ones were air mattresses.  I got one and it lasted for about a year.  It was expensive and I decided to do some reasearch before I bought the next one.  I decided I liked air mattresses.  They were comfortable and didn't run up my electric bill with a heater.  My research  led me to Coleman.  their mattresses are great quality and well made.  I bought a queen sized mattress and have been very happy with it.  It was not overly expensive and it has not lost air in the 3 months I have used it.  I sleep on it every night and am usually joined by a few cats.  I am so happy with this mattress.  It's a good buy and very durable.