Thanks for posting this article. I think many people get confused by extended warranties and it's a topic that needs to be dissected earnestly.
In all honesty, it does depend on the manufacturer as well as your driving habits. Not all extended warranties are created equal, and coverage will depend on the vehicle you buy.
Before you buy one, you should also consider what parts and systems are included for repair or replacement. Also, whether or not you plan to drive your new vehicle for more than ten years, or if you plan to resell the car after a few years. If yours is transferable to a second owner, having an extended warranty can actually help improve the resale value of your car.