Very nice for 2 years

Great mattress until it starting getting huge indentions where my wife and I sleep at night. We rotated this mattress every month and now that we have had it for almost 3 years the mattress is very worn in where we sleep. It is a king size but now only a foot is usable because no matter what position we go to sleep in gravity transfers us to the valleys. It's starting to hurt my back and I'm waking up with my limbs numb. When I first got this mattress I told everyone how good it was. I feel like a jerk for recommending it now.