We purchased two of these for our teens for a holiday gift, this was our first time purchasing a memory foam mattress. The mattress is hard at first but both teens say they are very comfortable to sleep on. The full size hangs over both of their full size bed frames so every few weeks we are rotating the mattress so it doesnt lean, other than this issue-the mattress popped right open and was fully unfolded in less than a few hours. We were also confused which side was "the top" but a quick message to Wayfair and we recevied a response within 24 hours.