I've got a regular extra firm Sealy Posturpedic and love it. Memory foam was too soft, and could never get comfortable on a sleep # bed. Since mattresses are now one-sided (no more flipping...yeah!!), I bought a European feather bed to put on top of the mattress. Love it!! The soft, conforming nature of the feather bed combined w/ the firmness of the mattress...sheer heaven for me!