We bought a firm Americana Cal-King mattress from Mattress Ranch right when we got married 21 months ago. In 10 months it had completely broken down. We were able to exchange it for the same thing but in extra-firm. Now it's been 11 months and the same thing has happened. The mattress is buckled on the sides and is sunken in quite a bit. We are trying to get a refund and will never buy from them again.