First of all let me tell you that I personally own this car ( XM variant) . So, my review is going to be completely original and practical.
If we talk about the design and looks then this is probably the best looking car in this 4-6 lakhs price range. This car has a sporty design and its rear side slightly resembles with the Grand i10 but Tiago looks better due to its spoiler. Let me tell you that this car has been designed by Tatas European designers.
The interior is very premium type and you will feel like you are inside a 8-10 lakh car. The dual tone dash board is stylish.
Its engine is powerful 1200cc ( petrol) .
The music system ( xt & xz) is very premium by Harman( JBL) .
Length and width of this car is best in this range. So, boot space is good. Height is slightly low ( negligible) . I am 6ft tall and no problem as it also has seat height adjustment. 5 persons can easily sit.
It also has so many awesome features that you usually get in a 8-10 lakh car.
Milage is normally 17-20 kmpl.
It even shows the gear number in display to avoid confusion.
Its higher model ( xz) also has safety features like airbags and ABS. It is also a stong car.
Overall, this is really one of the best car in this price range. I will definitely recommend it to anyone.
Only thing to concern is tata servicing but that depends on place to place.