We bought a Serta mattress in 1998 and within two years it sagged on both sides with a mountain between us. Looking at it now it looks like we have a mountain for a bed. We have turned this mattress weekly for 11 years but we're getting too old to deal with this King mattress. I know it is 11 years but it has been like this for the past 9 years. I wrote to Serta but they totally ignored me. Needless to say we are in the market for a new mattress. After having paid over $1400 last time, I'm hesitant to spend this kind of money.