I bought this mattress is AZ at a military AAFES store. It was a great mattress and slept well for about 6 months. After than the mattress began sagging on both sides. You could feel lumps in the middle 1/3 areas. I called Serta and they requested pictures and the tag information rather quickly. After submitting the information, they sent a specialist out to my home. He took measurements and laughed saying he had never seen a mattress go THAT bad before. 3 1/2" depressions, and the mattress cover itself seemed "detacted" from the internal parts. After he left, I waited a few weeks and nothing. I called Serta customer service as well as AAFES and both seemed to be clueless that I even exsisted. I provided my case number and finally was told my case was closed as non-warrantied. I was told it was because I failed to provide enough "proof of defect". I was beside myself! I asked for a supervisor and was told then that I failed to provide pictures of my mattress and they wouldn't send a specialist out until I did. I explained they had alreay BEEN out and measured. They said there qas no record of this. I had to start ALL OVER! I went through the whole process again. Meanwhile I sold my bed and was waiting for the new bed to arrive (special order) when the specialist arrived at my house. The mattress set was on the ground while awaiting the bed. The specialist immediately told me he was voiding my warranty for this. Serta required the set to be "property supported by a railing system". I showed him the pictures of the mattress set on the bed and explained that I had JUST sold it less than a week ago. He said it didn't matter - what matterd is what HE saw. So now I am shopping for a new mattress to replace it without benefit of a warranty exchange because my mattress at off a railing for 17 days - even though I had pics of it ON the bed, and the claim was made whil eit was on the rails and the first specialist failed to file correctly. Thanks Serta!