We have slept on our king 13" mattress for 8 nights now and I love it! Before latex, I was waking up nearly every morning with a back ache (2 back surgeries) and I have had no back pain in the mornings at all the last 8 nights. And...this is even with an ever so slight sag which I attribute to our old box springs we are using until we decide what we want to purchase to take their place. The latex is configured from top down as soft, med, firm, xfirm. My hubby likes his side, but my side may be just a bit soft. I am going to move my soft layer down a couple of layers and if I like that, I may trade in my soft for a medium.