Not to go against the flow, but I have a king serta that was from a Mattress outlet place and it is about 5 yrs old with no problems. My wife and I both love it and haven't had any issues. Quiet, even during certain times! and doesn't sag. We have been happy with it. One thing with mattresses though is that they are made regionally, its cheaper than shipping them everywhere. (At least thats what the sales guy told us.) Could it be possible that it depends on what factory it was made in? I always like to buy my mattresses cheaper as long as they are comfortable and replace them every 5 to 7 years. A mattress thats used everyday takes a lot of abuse. Plus you don't realize it because the degradation is slow to where you don't notice. I couldn't imagine sleeping on a 10+ year mattress.