I would have given this review 1 star, but the mattress is comfortable when you aren't sleeping on your back. I like a firm mattress, but this mattress is VERY firm. Maybe too firm. I've had this mattress 3 weeks now and the first few nights I slept great, but now I'm finding myself awake at night with back pain and discomfort. The smell does linger for awhile, but does eventually go away. It does seep into your clothes, though, which makes the odor last longer. We picked this mattress for the anti-bacterial/allergy/dust mite treatment cover because I suffers from bad allergies. I'm thinking I should have gone with the 11" firm selection. If you like very firm or more than normal firm, this mattress is for you. If not, go with a medium firm.