I just replaced my power cord on my MacBook Pro for the 3rd time in as many years. Each time the rubber covering starts to deteriorate and fall apart. The first time i was told that i needed to by a full packaged power cord set up for $80.00 to have it covered. Now i'm told that it is "environmental" and can not be replaced under manufacture defect. i agree this is not a "manufacturer's defect" it is a design flaw! i work with power cords and patch cords all day long in my profession. This is the only cord that falls apart on me like this. What kind of crap is this?