THE MIDDLE INSIDE SECTION STARTS LOSING AIR AND ULTIMATELY FALLS APART WITHIN DAYS OR A COUPLE WEEKS OF SLEEPING ON IT.  I'VE HAD THREE OF THEM (ONE AFTER ANOTHER) AND ALL THREE HAD THE SAME ISSUE. IT WAS ONLY ME SLEEPING ON IT (LESS THAN 150 LBS).  REFILLING THE AIR MADE NO DIFFERENCE.  I'VE HAD AIR MATTRESSES FOR A LONG TIME AND KNOW HOW TO USE THEM.  I'VE HAD AN INTEX SINCE (FOR A LOT LESS MONEY) AND IT'S HELD UP SINCE (OVER A YEAR) WITHOUT ANY PROBLEMS.  THERE IS DEFINITELY A SIGNIFICANT DEFECT IN THE LUMBAR SUPREME AIR MATTRESS.