I was excited to receive the new Kingsdown mattress, however, it does have a dip in the center upon arrival. I am disappointed also that it is a single-sided mattress. Reversible/flippable mattresses used to be the norm, but it seems that mattresses now only have one good side so expect your wear time to be decreased by approximately half. I'm told Kingsdown does make a reversible mattress called The Vineyard which will be my next choice and should have been my first.