I bought a single mattress. It arrived quickly and without problems. It grew to its full shape very quickly, a couple of hours, after unpacked.
The mattress is quite firm, which is what we wanted.
It has a printed pattern on its sides and bottom and some of it can be seen through the removable white cover.
It also has a softer white foam layer on top of the sleeping side onl6 meaning it should not be flipped. 
It was surprisingly heavy for a foam mattress so needed two people to take it upstairs. From the look and feel, it seems long-lasting.