Outstanding mattress,  To be a mattress in a box.  The mattress expanded to its full 8" height potential in just 24 hours.  It appears to be of good quality and the foam pad top is extremely comfortable.  I haven't slept on yet but tried for about 15 minutes and can tell that his is going to be an extremely good quality of sleep for nights to come.  The only negative I can see so far is that the corners aren't reinforced so they deform easily if sitting on those edges.  However this isn't a problem for me as this mattress went to my 6 years-old top bunk bed which only has one corner exposed and doesn't represent a problem.  In my case the mattress expanded to the full 8" height and definitely is a medium-firm feeling with the soft touch of the padded top for comfort.  Can't go wrong with this one!