I've had this AC unit for a month and it has worked great.  I was replacing an old in wall unit and wanted something portable that I could move into other rooms.  This has been cooling a 500 square foot room rather quickly and runs much quieter than my old in wall unit.   Glad I purchased this before the Summer heat really started to pick up, and since we've had some days in the 90's already its worked like a champ at cooling the room down