I had bought a $3, 600 King Size Serta Mattress from Sleepys two years ago. The Mattress warrantee is supposed to be for 10 years as you would expect with an expensive mattress like that. However after less than one year the mattress started to sag towards the edge making it almost impossible not to roll out of bed unless you constantly woke up and re-adjust your sleeping position. After two years it has become so bad (it sages from the center to the edge by 9 Inches) that I can no longer sleep on the mattress and had to move to our guest... read full review »