There is obviously a quality control issue with these. I will be well on my way to number 3 shortly here. These chargers are more suitable for a stationary computer. People who let them sit in one place alway, almost always hop on here and laugh at those of us who complain about them because were mobile. These things do NOT last in a backpack even when coiled properly. Apple will never see my wallet for a computer again plain and simple, because I should not have to shell out between 60-80 dollars every year on a cord that should have been recalled and redesigned years ago. There is no reason that the sheath protecting the electrical line to my computer should be disintegrating after a year of use. The engineer manager behind this cord should be fired for not redesigning it. Jobs would not have had it. He would have sounded the alarm on this thing until it is perfect.
Apple, pull your head out of your ***. As a college kid on a ramen noodle diet, this laptop is pretty much the most expensive thing I own. I can't be shelling out for this cheap piece of crap. The least you could do is offer free replacements if we bring it in and its shredded, especially for students. My $80.00 a year is going toward building a PC and upgrading it when the time comes. I encourage everyone else to do the same, because those cords are made with durable plastic, not fragile rubber.
Cheers.
PS Microsoft is really making a turn around, this F***ing charger will be the bane of the Mac Book Pro.