The only good thing about Renault Duster is the space and looks - however, unfortunately these are not the only things one tries to find in an SUV car segment. There is much more like seats at the back, more comfortable seats, fuel consumption, gear smoothness which a customer expect when spending for something more than 10 Lac INR.
I would suggest to take your call in terms of what you are exactly spotting in a car then only go for Duster like there are no seats at the back, gear changing becomes hard after some time, seats are not comfortable, AC is not that effective, Average is around 13-14 with AC and without AC is 14-15 in the city.