I had my Focus for one year and put on 15k. I didn't have any mechanical issues at all. The car was great on gas, about 25-36mph, city/highway. The car was unstable at highway speeds in snow even though it had traction control. I crashed the car in snowy conditions and was able to walk away with only 2 small scratches. I'd get another one, but wouldn't drive it long distances in poor winter weather.
Great gas mileage! Lots of cargo room for a small car.
Very unstable in poor winter weather at higher speeds compared with heavier cars.