I have had my mattress for almost a month now and it still has not "inflated" on the corners and sides. Although it has been leveling out slowly, I find myself compensating for the fact that the surface is not flat. I have put the bottom and left sides of the mattress on top of the border of my platform bed for an extra 2-3 inches of height. I've also piled the top of the bed with pillows, effectively sleeping on only center of the bottom 3/4 of the mattress. This works for me because I'm not a tall person. I'm trying to be patient to see if it rises some more. I believe the material is top quality, very comfortable in the center. But I don't think the packaging process is ideal as it flattens parts of the mattress differentially, probably for far too long.