This mattess is so comfortable and of higher quality than I was expecting. We got the Cal King in medium firmness. For the first couple weeks we had it on the floor and it was a lot softer, but still provided support. Now we have it up on a platform bed and it feels much firmer. When it was on the floor I almost wished we had gone with the firm, now that its on a platform, I'm glad we didn't. It's perfect, and for the price, this bed can't be beat. We haven't had it for more than a month yet, so I don't know how well it will hold up in the long run, but we're very happy with it. Another plus is that you can barely feel your partner moving around next to you! Oh, and there was no smell when it arrived and it puffed up to full size within a few hours.