It is as advertised! Feels like a foam mattress but you can feel it pushing back up at you to softley support all of your body. It took a couple nights to get used to it. We loved not having to deal with the mattress stores and the headache of trying not to get taken. It arrived in a few days and took only minutes to setup. We saved our old mattress and will donate it to someone in need in Florida as we were hit by Irma. We love our mattress and can't resist telling the "Tuft & Needle story" to all of our friends.
The mattress is just the right hardness for a comfortable nights sleep. I'm a big guy and haven't noticed any deformation or sag in your mattress like I have others. My partners tossing and turning does not transfer noticeably allowing me to sleep without being awaken. Very good product!