We received this mattress a week ago, there wasn't any smell when we opened it. We placed it on our box spring and let it regain it's shape which only took a few hours. We slept on it the same day it was delivered. We love this mattress and now wake up feeling refreshed without any back or neck pain. We also use the memory foam pillows with the bed. We chose the firm and are very happy we did. It is very comfortable and we don't sink down into the bed. I slept on a soft and tried a medium and firm before we bought the mattress. The soft made me sink down to much into the bed and made it hard to move, the medium also just wasn't firm enough. I don't have any problem rolling over in the firm and sleep very well now, also there isn't any problem with being to hot while sleeping on the mattress. We are going to purchase others this year for our children, they love the mattress also.