The on board screen allows you to monitor your fuel economy in real time helping you develop more fuel efficient driving practices, i.e., advanced de acceleration in anticipation of stop signs/lights, slower acceleration, and easing up on the accelerator.
Although I have had one major problem with the battery the car has held up very well otherwise.
It may be ugly to some but I really enjoy the distinctive appearance which singles it out on the road. It makes me feel more like an individual rather than part of the masses. That is changing as the car gains in popularity.