We bought the softer SF mattress and was disappointed that the pillow top began to crater after just 3 days. After 60 days, we just couldn't roll out of the crater and decided to get the other mattress that didn't have such a thick pillow top. Now that we've got 30 days into the Estate mattress, it has maintained it's firmness. The problem is that it's way too firm. I am buying a topper in hopes of getting some releif because I can't sleep on it anymore, just too painful. I hope the premium topper provides a better durability thank the SF first mattress. I just can't take it.