We had another popular mattress for our king-sized bed for seven years and it was not leading to restful sleep. We changed our pillows, blankets, sheets. Not until we changed to a GhostBed was our problem resolved. Also, easy to bring upstairs given that a king-sized mattress normally requires a lot of logistics.
So far we are not overly impressed. The matress initially feels cool but quickly heats up. Comfort wise we are still adjusting. It is fairly comfortable. We are going to give it a couple of more weeks but at this moment we may have made a mistake with this matress.