My dad bought it in the year 2008 and trust me till the year 2014, we didnt had any problems or complains with this amazing car, as after that we bought a new car that is Maruti Ertiga.
But I still miss Santro, it was very very fuel efficient and runs smoothly. On the highways we can easily cross 100 km/hr speed. The cabin of this car is also intact, as I have seen in one of the highway accidents, the passengers are safe even after an accident by truck.
We had the black colour one, and trust it looked very cool. The size of this car is small, hence not having a problem on the roads of mumbai. We can easily park it even in a very small place.
Overall, I would say a very good car, and recommend you to buy this car, as its comparatively cheap, in case you are willing to buy a car.