On May 5, 2007, I purchased a Serta Genesse Queen Sized mattress. By December 1, 2007, in just seven months, The Mattress Warehouse replaced the mattress because it sagged so much it met the 2" sag limit that justified replacement. They replaced the mattress with another Genesee mattress that they said had been enhanced to correct the original mattress defects. It is now March 3, 2010, and the Serta mattress inspector is due at my house in two days to see if the "new and improved" Genesee has sagged all the way down to the 2" minimum sag. It appears obvious that the defect correction applied to the Genesee line of mattresses is nothing more than a band-aid designed to hide the defect rather than actually fix it. My mattress is unusable at only 2 years and 3 months on a mattress guaranteed for ten years.