Extended warranties are about the worst investment you can make but Dick's was crazy enough to sell me one on the Coleman air mattress I bought. It's not like anyone I know would set a calendar reminder a month before the warranty expires and arrange an accidental meeting with a sharp object around that time.
I've got a Coleman tent that's going on 12 years old and still in excellent shape. I can fit 10 kids or 6 adults in there comfortably. We also have had Coleman inflatable beds over the years. Our last one bit the dust when we decided to use it as a launcher for the kids! Right now I have a self-inflating sleep pad and I believe it's a Coleman too. It was a gift a few years back so it hasn't seen a heckuva lot of use but it is comfortable. It works pretty well at keeping the hammock spread open so my sleeping bag doesn't fall out one side or the other while I'm trying to get in the hammock.