Mine is Top model: with AC + power windows in front windows. Heater, Body colored bumpers, fog lamps.
Pros:
Spacious. In fact more cabin space in front row seats as compared to my Tata Indigo. Rear row is less spacious than tata indigo. 2 Adults can seat comfortably in rear row and 3 adults can sit with their shoulders touching each other. (However more space in rear row as compared to Maruti 800)
Bucket shape front seats that provide good upper and lower back support. So not the case where in you buy Maruti brand cars and then complain for lower backache.
Easy to get in and out of car. I am 6 fit tall and can sit in car without my legs touching the steering wheel which is common in most of the luxury cars.
Good head room and leg space. In fact the bonnet space is given in cabin where front row passengers keep their legs. So thats the reason you get good space.
AC is powerful. In fact I would compare this AC with Maruti Alto car and both seem to be same. Since the engine is in the back and condenser is in the front so it takes less effort for condenser to generate cool air as opposed to conventional design of cars where engine and condenser are both in front bonnet and condenser has to fight with engine heat as well.
AC blower is as powerful as Maruti Alto car AC blower. So no problem for back seat passengers.
Mileage: Mine has given me 20.27 Kmpl (recent full tank) with AC-on all the time.
Overall good body design. Easy to drive in traffic.
Turning radius is very less (not sure in numbers). Easy to take a U turn on busy roads of Delhi. I tried on even very narrow roads and was amazed to see the complete U turn without backing the car.
Car engine is in the back so engine noise is very very less with AC on and windows rolled up. (People are complaining as the engine noise is same as Bajaj Auto however I would say please dont compare a EURO-4 compliant engine with any other ordinary engine.)
Electronic temperature control (that means no meter for temperature and only a light signal that tells about temperature).
Cons:
No power steering. Steering is harder than Maruti 800 manual steering.
Battery is placed underneath drivers seat which could have been avoided.
Radiator is touching back bumper. Even in case of mild accident, chances of breaking radiator are very high.
Missing glove box. Even though good dashboard space provided however a closed box (like glove box) could be plus so as to keep car papers, first aid kit and other small misc. things.
Rear view mirror which is inside the car for driver is light weight and vibrates like anything on low / high speeds. Could have been avoided. (Though I am ok with it seeing the price of car)
Access to boot space is by lowering the back seat and tray is attached to the back seat. So I am considering a situation where speakers are mounted on back tray then it would be little uncomfortable to place luggage in boot space.
Radius of front and back tyre is different and spare tyre is provided for front tyre. Not sure if the same can fit for back tyre slot as well so that one can drive till a point where you get the flat tyre fixed.
In case you live in Delhi and considering of fitting CNG in it then you would be disappointed ;-) as the engine is beneath the boot space and can be accessed through boot space only. So if you get the CNG cylinder fixed in boot space then there is no way you can get your car serviced. :-)) Anyway dont worry about it since Tata has taken care of this problem by providing good mileage.
So overall I am fully satisfied with the car even with some Cons.