The saga started about two years ago. We bought a king size Stearns and Foster Ella Grace mattress and box spring. Within a few months, there was a distinct sag on each side. We're not overweight... Stearns and Foster replaced the mattress and box spring with no argument. Yay. Replacement mattress and box spring began to sag within a few months. Stearns and Foster refunded our purchase price. We bought a Sealy Ivy Brook. And within several months it too was sagging. I emailed Sealy customer service - but never heard back. We're leery of buying another mattress and box spring because we fear every brand will end up sagging.