Disappointed

We purchased this mattress with the expectation that it would last -- paid top dollar, and from a "respected" manufacturer. The mattress was great for the first year or so then it went down hill. The manufactures method of measuring sag is flawed and is only intended to provide them with a way out of dealing with warranty claims --- By the time your mattress means their criteria you would have replaced it long before. A 6 year old mattress, and $2200 down the drain. My $800 non name mattress on my previous bed lasted much long, and is still in us by others 15 years later.