When I first received mattress it was the best. Close to 3 months,  the mattress was sinking. Returned it and received another one. Thinking,  well maybe that mattress was defective. I received a replacement and and it's sinking.  The firmness of the mattress is just what I wanted. Woke up mornings no aches or pain. Now I find my self having to scoot to one side or the other to find that firm spot.