Hubby and I have had this mattress for almost 3 weeks now, I can say hat I am getting a much better sleep, however, I am waking up with lower back pains. I feel as tho the middle of the bed is softer, like my lower half sink deeper into the mattress that my top half. I have the build of a stick figure, weighing in at 110lbs so I don't think my size is the issue. My husband, who is the opposite, 250 is noticing the same discomfort.