Depands on a couple of things.. Are you planning on sticking with the car after the first 4 years are up? Are you planning on going past the industrial standard of 12-15k miles a year? Will you be doing the maintenance on the vehicle yourself after the original warrenty is up? Does the company have a good recent history of their vehicles being fairly reliable past the 50-60k mile mark. Is the price right for you? etc.
I personaly don't own a new car, and don't have much experience with owning one, but if I was in your position, these are the questions I would be asking.