I am using NANO from 3 years [UP14BC7090], run only 14000 KM, done all 6 services on time, oil changes 4 times.
So far three time breakdown. Breakdown service also no helping during breakdown.
still not able to resolve starting problem .Whenever you contact TATA, they will tell to go to their FRAUD service center and leave car for at least 1 day and no guarantee for resolution of problem.
Contacted top management of Tata motors, but they are in favor of their dealer. They do not CARE at all for victim [I mean customer].
No spare will be available outside. No one can repair it. The warranty of 4 year is fake and in 4 years you will be frustrated and wish that your car will got fire so at least you get something from insurance.
Please go for Nano if you want to waste money and buy trouble.