Took the mattress out of the packaging around 5:00pm and were able to sleep on it that night. We have been sleeping on the mattress for a little over a month and we are very please with it. My husband was having problems sleeping for years and always had a sore back in the morning. After trying a mattress with box spring and then an air style mattress, we decided to try the Memory foam with cool max cover. After a week or so, I noticed my husband was not complaining about his lack of sleep or his back. I am happy we went with the cool max. Although we haven't slept on this mattress in the warmer months, so far we do not notice any extra heat from the memory foam. Happy to say so far this mattress is better than expected, especially for the price.