After only 4 months of use this mattress is already sagging in the middle. I am not a big guy or a heavy guy and was very surprised about the sagging. I have even tried to sleep near the edges of the bed, but the slope that has already developed causes me to migrate to the middle. The pull of the slope now makes the bed uncomfortable. I am writing the company to see about a replacement. At first I really liked the bed as it was very comfortable. But I would hope and expect that it would have lasted for years before sagging in the middle!!
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