I bought my Stearns and Foster mattress at Mattress Firm. I have always had back problems and was willing to pay whatever was necessary to insure a good night's sleep. I was impressed with the company's warranty and was assured by the sales person that it would be honored if I had any sagging problems. Because I suffer from scoliosis I need the bed to remain firm. Any sagging or "conforming to body indentations" results in pinched nerves and pain. I was assured that this mattress would hold up. After only 3 yrs of use (I am less than 130 lbs.), it developed a sag in the middle enough to roll me toward the center, causing back pain and sleeplessness. When called out to inspect, I was told that it was a "normal body indentation" and was not enough to be covered by the warranty. I called them back one yr. later at a $25 expense to hear the same thing. I might mention that at approx. the same time my 200+ lb.boyfriend bought a less expensive Stearns and Foster, and his mattress is still firm. Stearns and Foster needs to stand by their product, and make good on those that do not deliver the quality that is expected from such a high end mattress. When I specifically asked for a mattress that would not sag, I did not expect to buy one that would sag "within limits". It is not a small matter to get 3-4 hours of sleep and wake up with numb hands and stiffness. I know that it cuts cost to charge for a 3rd party to come out and measure/evaluate, but sometimes customer service has to go beyond the numbers and evaluations and meet the needs of the customer.