I love the mattress itself (firmness) but it has been 48 hours and the mattress has only expanded to 12in, not 14. It was placed flat on the floor in an unoccupied room as to not impair it reaching the fullest expansion. I am disappointed as 2 inches does make a difference in the height I desired for my platform bed style.  I have seen that some were advised to wait 72 hours so I will give it another day even tho MY package directions only specified 24 hrs. also I have 2 corners that have not expanded so on the right side of the mattress it is somewhat curved and not flat as the corners did not expand as they should have. Will wait another 24 hrs and update this review