This was a really great buy!!! It arrived a week after it was ordered. It grew to a full 11 inches it a matter of a few hours. It did have that famous chemical smell everyone talks about, but it wasn't unbearable and it went away rather fast. Either that or we just got use to it..LOL. We ordered the Full size with the Soft firmness. I like firm mattresses that have a cushy feel to the touch and this is what this matress is. I think that the Firm or Medium firmness would have been too firm. I sleep on both my sides, back and stomach, and this matress is perfect for any of those positions. I suffered from backaches on my old matress, but have not had any with this one. I sleep through out the night now and I do not toss and turn. We even put this mattress on our old box spring and it has been doing a good job. Standard fitted bed sheets do not fully cover the sides of this mattress because it is 11 inches thick. There is about 1.5 - 2 inches of uncovered mattress. This doesn't bother me, but if it will bother you, I'[m sure you can purchase special sheets for thicker mattresses.