We had this mattress only three years when it started to sag on my husband's side- - this progressed and after having the mattress for four years decided to contact the company since it has a lifetime warranty - well after a lengthy process and having an insurance adjuster come - they denied the warranty because of a small coffee stain not even anywhere near the deep 1.5 inch sag. Do not every buy from this company - they do not stand by their product.

Worst purchase I have ever made. Only lasted 2 years before becoming unbearable. Do not buy this mattress!

My wife and I have had a Sleep to Live mattress for about a year and a half and it is one of the best things we have done. You sink in a little bit so it is really comfortable, but still provides great support for our backs. I often woke up lower back pain and a stiff neck in the morning with our old mattress. After getting the new mattress, the lower back pain in the morning nearly disappeared after about a month, and stiff neck is gone.

As for durability, after a year and a half, there are slight body depressions that you can see if you look close on either side of the bed where my wife and I lay. This does not seem to affect the support at all. I remember it took a couple of weeks to kind of break it in when it was new. It actually felt a little stiff. Now when we climb in bed, it is like putting on a comfortable pair of slippers. The stitching seems to be holding up well. The fabric is still in great shape, but we use a mattress protector cover. This really is a great mattress.