Once they finally inflated entirely, they are very very comfortable.  It will take several days for the topper to reach it's max height/peek state.  It will also take a bit for the "fold" in the center of the topper to relax.  I would recommend opening it on a surface other than your bed, laying it upside down and allowing it to relax entirely for about a week, prior to use.  My teens love it now, but we did question it for a couple of days.  Just took some time.