I bought a king size Serta euro top perfect day mattress in aug of 2008. After sleeping in it for 3 months there body impressions. You could see the impressions. The store I bought it from came and measured and of course the impressions were not big enough to take it back on warranty. In fact the guy doing the measuring wanted to wait until the afternoon to measure so the mattress had time to "bounce back a little". We finally bought a Tempurpedic and couldn't be happier, its a glorious mattress. THE BOTTOM LINE IS SERTA... read full review »