Apple's MagSafe chargers are absolutely fantastic from an electrical engineering standpoint, where they tend to fall flat is on the cables/connectors.

One of the things that has extended the life of my chargers is to be careful when wrapping the wire around the two ears, leave a good bit of slack so that you don't over tighten the charger wire.

This alone has solved most of my issues with my Apple MagSafe Chargers, and I have one that I've had since 2007 that is still in full working condition.