I have been using Zen Estilo for the last 2 years. I am greatly satisfied with the machine, but for the problem in vision of the road.
When I wanted to change my car to the next higher segment from Maruti 800, I had 2 options in Maruti. One was WagonR and the other one was Zen Estilo - both are same except for the looks. The sheer look of Estilo captivated us (a friend of mine was also in sync with me) and we settled for Estilo.
It is a great machine, overall. But I find only one snag. The location and width of the front right side member (see picture) hinders my vision of the road on the front right. I often find that while turning right, I have to shift my head sideways to have a clear vision of the road and vehicles. Once while I was on a roundabout (round-tana), a cyclist was almost invisible since he was blocked by the front right side member and the front quarter glass. Barring this, it is a good car, and it has been highly reliable.