I own a Chevrolet Spark LS for 4 years now. It has been a peaceful and trouble free experience so far.
I have to admit that there are hardly any manufacturers that make bad cars these days. Having said that its surprising not to see too many Sparks on the road. The car deserves to be on the road.
At the time I bought the car, the other comparison I made was with the Maruti Alto. The lack of space inside the Alto was the reason why my wife and I decided against the Alto.The fuel efficiency of my Spark is around 13-14 kmpl. Which is not too bad but as Indians we want the best possible fuel efficiency.
The best part of the ownership has been the zero maintenance issues. Am happy with the experience.