Bought a new mattress because I was waking up each day with a headache out of the back of the neck, stiff shoulders and hip and back pain. After narrowing everything down, the last thing to do was get a new mattress. Picked this one because of the different firmness levels and flipability. I started with the firm side and immediately stopped having daily headaches each morning. I am now starting to see relief from the shoulder pain and back pain and am sleeping more sound. Its been three weeks and I am glad I made the switch. Planning on switching all the mattresses soon.