This was my first memory foam purchase and I was skeptical at first however, this mattress is extremely comfortable! I like a firm mattress with a little give and this ended up being prefect for me! In fact, it is so comfortable, my sleeping has improved! Almost too good as I am having a harder time getting up in the morning! Haha It was a full 10” in less than 6 hours. There was no smell at all as mentioned by other reviewers. I ordered the 10” full size. The box was a little difficult to open but that is because it was packaged so well in a thick box and my lack of a box cutter. Love it so much! Would definitely purchase again!