SO COMFORTABLE!  I have been sleeping on what felt like a cement slab for the last couple of weeks due to an incorrect item being shipped to me.  I have not slept well at all and was in pain every day (bad upper and lower back).  This bed showed up 2 days ago.  The first night was rough as I was not used to the mattress.  However, night 2 was AWESOME and I actually feel rested today!