My experience of Zest in the ten months I am using it.

Exterior

 Stylish body with good lighting system. Good ground clearance. But workmanship shoddy. Bonnet lock plastic cover gave way, wiper spray pad on the bonnet not stuck properly. Tata Motors have agreed to replace. Side rearview mirrors could have been the folding type.

Interior (Features, Space & Comfort)  

Comfortable Interior with good A/C and leg space. Seats front and back comfortable for five adults. Good infotainment system. 

Engine Performance, Fuel Economy and Gearbox

Powerful engine though the torque conversion for the first gear is bit too much. Car moves at 10/15 kph without any acceleration. But engine is noisy. The engine used to stall often initially which was rectified but still even now occasionally the engine raises uncomfortably even with very slight acceleration which takes you by surprise. I get only 9.5/10.5 km/l in city drive even after the dealer and Tata Motors tried their best. Very disappointing when they advertise 17.2  Km/l. Shifting to reverse gear is a problem quite often and shifting to other gears is also noisy.

Ride Quality & Handling

Car gives a comfortable ride quality and driving comfort is also good. But occasionally while taking U turn, I find that the steering does not return automatically.

Final Words

The car has fallen short of my expectation as I was happily using a Honda City for 8 years and went for the Tata Zest after reading the reviews and the supposed to be advanced features developed by Tatas. 

Areas of improvement  

 Workmanship has to improve. And the Engine has to be absolutely silent especially in idling.

 

Good appearance, ground clearance, music sys. Comfy Interiors. Engine power good.V. Poor mileage in city, Gear shift not good, Engine noisy, Rattling in rough road.