My Grand Prix is now approaching 120000 miles, and I've enjoyed every minute I've driven it. This car is great to drive: it handles well, is comfortable, and runs great. The only problems I've had up to this point have been with the power windows (see below) and losing headlight covers, which as I understand, is a common problem with this vehicle. Other than that, I highly recommend looking into this car.
Spacious interior, acceleration, and all-around enjoyable to drive.
Power windows are extremely unreliable. Windows will stop working, and five minutes later work with no problems. I have had all four windows go out on me, but as of right now, none permanently.