Sags within the first couple of days when used on an adjustable foundation. If I moved an inch or so to the left or right I was sleeping at an angle. This is an extra firm mattress. It was pretty unbelievable that this could happen so quickly.

After test it for 18 months it's less firm than expected. I feel like when you stay in one position, the mattress adapts to your body's shape. It dips lower than expected, and I weigh 214 pounds.

The seams in the mattress are so deep the mattress feels lumpy. It also holds body heat, making sleeping all night impossible. Sore backs for 2+ months after switching to this mattress.

Mattress is very stiff and hot sleeping.

helped allot with neck and shoulder pain I have when sleeping on less firm mattress

so far so good, but thought it was extra firm, i think its firm .

Cooling, support, and comfy

great night sleep, no back ache

Nice firm comfortable mattress.

Its a little firmer than I prefer