I have read AGS tend to give trouble after 30,000 km or so. AGS is basically a manual transmission with a mechanism that presses the clutch and changes the gear for you. Sort of like a robot. Too many components to go wrong.
You may read the following:
There are much on Maruti AGS as well.
So advise you not to purchase the AGS version of this car, If you absolutely don't want a manual car then go for CVT or automatic car.