An 01 with 46K miles sounds like a real cream puff and a great find. With 130HP or so, you're not going to win too many drag races but as you have learned, they handle pretty damn nice.
Very early foci do have a couple of notable problems to keep an eye on. One was the brakes. Ford delivered a lot of early cars with some very poor quality front rotors (poor metallurgy that resulting in uneven bedding of the pads). If the front brake rotors haven't already been replaced and you feel some pulsation coming from the front, consider some new rotors in the near future. As mentioned above, Ford also had a batch of crappy springs on the 00-02 cars. They rusted really bad and are prone to snap in half. Keep any eye on those as well. If you do have to replace them I strongly suggest the SVT suspension kit (springs, shocks and bigger rear sway delivered for less than $300.00). It turns a nice handling car into a great handling car without much impact to overall ride quality. The fun quotient goes up at least two fold. The springs will lower the car about 1/2".