I love this mattress! I was skeptical and afraid at first just because obviously you can't lay on this before you buy, but after reading all the positive reviews and the great price, I decided to try it. I'm so glad I did! We got the medium - my husband likes a firm bed and I like a soft. We're like Goldilocks now, and it's just right for both of us. Firm but soft... doesn't feel like you're sleeping on a board like some mattresses I've tried. We previously had an innerspring with pillow top mattress that had basically become a hammock and we were both waking up very uncomfortable and squished together in the middle. This is a dream! From the first night we both slept really well, more soundly, and much more comfortably. It did not have much smell at all, but we did air it out for about 24 hours before putting any sheets on it or anything. I have not noticed it being hot at all. We upgraded from a queen to a king and the extra space was definitely worth it! Glad I went with a 12 inch mattress instead of the 14 inch because it is very thick and the 14 would have been too high. We got it in 3 days after ordering and it was easy to put in the room and set up. My sleep has been better with less tossing and turning and waking up in the middle of the night. Also absorbs movement so it doesn't wake me up when my dogs move around at night, and when my husband comes to bed after I've already gone to sleep, I can't feel it at all. So glad I made this purchase... you spend half your life in bed, so why not enjoy it? Great value for the money!