I can't find the document but Apple's official instructions for their chargers include winding around the pop-up plastic legs. I've never had a frayed cord since the days of the TiBook, but I have managed to break a leg on the adapter and crunch the connector when the laptop fell while connected. MagSafe, while a little pricier, has been more cost-effective for users compared to the truly unacceptable design that existed before.