I will make it short.
Pros :
Looks good in both exterior and interior department.
So many engine options to choose from.
Good list of features, specially in the higher versions.
Decent performance in diesel engine turbo petrol.
Cons:
Build quality. Since it shares the same platform as Hyundai Venue which is 3 star suv.
Overpriced. Dealers don't give any discounts. Hardly 5k.
Legroom. It has horrible thigh support in rear seats. It was a deal-breaker for me. You will also feel that you are seating in hatchback and not in suv.
Reliability. Kia seltos already had some hiccups when it comes to reliability. Sonet comes with dct and automatic options which I believe not reliable as conventional naturally aspirated manual transmissions.
I think at that price we have so many better options. I personally booked Ford Ecosport diesel titanium sport which is far ahead than Korean motors. You can also go with Nexon or XUV300, both are amazing cars. Only concern with XUV300 is its boot space.