Hey buddy welcome to TAI
Yes it does hinder the visibility a bit during night especially the sides when you are making a turn. But nothing to worry about , you will get used to it. Almost 90% of the cars on road have sunfilms! Yes if you put sunfilms which match the color of your car your ride will look stunning! 3M , Garware , Llumar , Vkool are some good brands.
I don't know the pricing of other brands but for 3M i think it must cost around 4k for sides and rear. Front windshield sunfilm is a bit costly , comes around 8k i think. I sat in an Innova with front sunfilm and i din't like it , to each his own! You may even like it!