I bought 3. 2 doubles and a single. My kids both love them. Me, on the other hand, I hate it. I have heds, and I get up in more pain than I go to sleep in. I've currently got a thick topper folded in half covered in a blanket and wrapped in a sheet just to get some comfort. 
The mattress doesn't expand quickly enough when I go to the loo, so I can't get comfy because I roll back into a hole.  I expected a memory foam mattress to be softer. 
The site does say I can return it within 100 nights but doesn't tell you or send you with a mattress bag to return it.  Boxes that size cost a fortune and even if I saved the box it's not going back in now its expanded. You should provide a cover in case we need to return it. That way your delivery drivers can't moan and will take it.