We had very favorable results.   Our car has successfully navigated a number of courses of varying length and complexity, all containing turns drastically sharper than the turning radius of the car.   The ability of the car to distinguish line from floor was about what we expected.   A line in electrical tape on the floor of Phillips Hall works quite effectively.   Our design is not entirely bug-free, nor is the car fail-proof.   Given more time, we could add features like the ability to navigate courses which cross themselves (like a figure-8), or track down that pesky bug which infrequently surfaces (we suspect a power-supply isolation problem).   All-in-all, the functionality of this vehicle is quite robust so long as we don't crash it into anything.