I have tried every mattress my surgeon suggested and still I wake up with back pain and numbness. After having back surgery I dread sleeping. I have been using this on recommendation of a friend who has one on each of her beds and slept amazing. I am sleeping on average of 6-9 hrs a night up from 2-3 hrs. I wake up feeling refreshed and no more numbness. You literally  feel like you are sleeping on air. I wish I would have known about these earlier.