Less than one week with this new mattress system, so we need more 'mileage' before we can truly declare our rating. We traded out a ten year old Tempurapedic bed and immediately noticed that the new generation one is a heads and shoulders improvement in terms of comfort. We simply no longer have pain in the morning. Things that will take time: Getting use to cal King split; trying to figure out best positions for sleeping; and where to store the remote at night, while still having easy access (not obvious).