This is more of a soft-medium mattress.  It fluffed to its full potential in a few hours.  We slept on it the first night and have noticed no changes since then.  It is comfortable.  You can see the layers in the pics.  It squishes easily.  The sides slope so if you sleep close to the edge it may feel like you are sliding off.  It came in a long box and weighs over 100 lbs.  you may need help moving it, but the box slides easily.  We like that it is a hybrid mattress, and does have more support than a basic memory foam mattress.