This is a firm mattress but if you sit on it it will sink in a bit. once you lay down on it then you can feel the firmness. it came in a huge box with wheels and a handle which was great for those of you who want to know about package delivery. Once opened, it immediately expanded to its full size. there was no need for me to wait 2 days for it to fully expand. if you are wondering about a smell well there isnt one...unless you bury your nose into the mattress all the way in. this is my first memory foam mattress and i took a huge chance by making an online purchase which i dont regret. i have had this mattress for a couple days now and ive had such great sleep.