I was skeptical as this was my first mattress in a box, but so far the bed is really comfortable. I would agree with people saying it is more on the firm side, but you still sink in a little bit. It's comfortable both on my side and back. I've recommended it to others.
Wife is remembering her dreams now, which mean she is getting better REM sleep. I use to wake up every night sweating with old bed. The first night with ghost bed I woke up chilled. Now we sleep with two blankets and any pain we had is gone.