So far all we have done is take it out of the box and let it rise and I am beyond happy! We opened it at 1230 and by 430 I’m pretty sure it already up to the 12inches! We have sat in it and laid on it to see how firm or soft it is and all I can say is I can’t wait for bed time!! I will write again in a week to keep you updated on how well we sleep because our traditional pillow top mattress we bought brand new 3 years ago has been horrible and hot! So I decided to give this one a try