This is an exceptionally nice mattress - but be advised, size up in height (i.e., if you want an 8 inch, buy the 10 inch, and so forth).  The first time, I ordered an 8 inch, and parts of the mattress only expanded in height to 5 1/2 inches, and other parts to 6 inches at the most.  Wayfair customer service was very helpful, and offered to exchange, which I took them up on.  With the exchange, I opted to get the 10 inch, paying for the difference in price.  Just as I thought might happen, the 10 inch only expanded to 8 inch (which was the height I wanted to begin with).  Would have rated 5 stars if it weren't for the height discrepancies.  Despite the hassles, this is a glorious mattress, though manufacturer needs to sort out what the issue is causing this problem.  I noticed other reviewers commenting on height issues as well.