Purchased two mattresses for our split king frame. Both wife and I sleep differently. I'm a side sleeper , she sleeps on her back.  After the first night I awoke  amazed.  Long time aches and pains from a life of hard jobs, both paratrooper and Police K9 were gone. I'm not saying diminished,  totally GONE. I didn't say anything about it at breakfast. My wife was like, "OMG babe, my back is not.stiff". 
  These mattresses are amazing. Kingsdown says they are the top of the mattress world and now I understand why. They are and bring the receipts to prove it. Absolutely recommended!