I have an experience of almost all small car, but I felt that NANO is far far better then Maruti and I10, It is having good leg space as I am 6 ft tall(I had big time trouble in sitting in driver seat in MAruti and I10 but in NANO I can sit comfortably, In city it is giving 23KMPL as measured. I can drive it on top speed of 100 KMPH without any problem, As the it is giving 23 KMPL we can drive comfortably on Highway, Its AC is very good.
Over All This is really far far better than MAruti. SO I RECOMMEND IT IS BETTER TO BUY NANO THEN SPENDING MONEY IN MARUTI AND i10.