This is my review. Eight years ago, I got myself this Pranasleep Vinyasa mattress after checking it by lying on it at the store. When it was delivered I found it way soft and hurt my back. I got it exchanged for the Firm model. For the first four years, this worked fine for me. Then I started feeling lower back pains. Last year I tried avoiding the mattress and sleeping on another bed. And the back pains went away. That was when I called the store and told them about the problem. They told me to try putting a board under the slatted foundation. But that did not help at all. The store tells me that if decide to buy a new mattress, I can get a good discount.