This mattress took a good 2 days to expand. It is quite heavy and definitely requires two people to move onto the bed or 1 VERY strong young person!) This is a very comfortable bed. It is firm enough that I dont feel like I sink into it, but it is still extremely comfy. I replaced a 10 mattress (I moved the 10 into another bedroom) with this mattress. Now my bed is pretty tall but I love the look! I need to get a small wood step stool because I have about a 6 dtop when I get out of bed. Also, I would suggest buying a King Size bedspread to ensure any box spring is covered. I highly recommend this mattress.