Simple the best bed you will ever buy.
I purchased this bed and have been so satisfied with it, we say every night how comfortable the bed is. You can adjust the 3 different layers (Extra Firm, Firm ,Medium, soft) around to suit your own taste for comfort.
My back is all fused together, so I can only lay on my back, and in one position all night and I am so comfortable.
Sometimes I Unzip the bed and and turn the layers over and it feels as good as the day I bought it 5 years ago.
The company stands by their product and warranty, a first class operation without a doubt.
I would stay away from any soft layers, medium will give you better support and comfort. This is the best bed you will ever buy, period. Your not gonna sink in a hole and have to purchase a new bed, no it's still like new condition.