I bought my Kingsdown king sized mattress on a recommendation from a close friend who had one for many years. While we were shopping for hers, I decided to try one since I was unhappy with my own too firm mattress. So we each bought one. I’ve had mine now for two nights, and it’s perfectly firm with a princess worthy plush top!  So far it was worth the two month wait for delivery to my state. My morning backache is gone!  May it be for good.