We purchased this mattress on Feb 23 2008. It is Feb 3 2010 and this mattress is now a major paper weight. It has lumps, valley's and now I feel like I sleep in a narrow gutter. Even when first getting into bed, the memory on the foam has ceased to go back to it's flat state and when putting new sheets on the bed, you can see 2 deep dents where my husband and I lay. Back when we bought it, it cost us $****. To spend that kind of money on a mattress that lasts less than 3 years is in my opinion a terrible buy. These dents began about 8 months ago and have got so bad, that I now dread going to bed. Beware... this bed will not hold up with time.