mine's tinted. makes a world of difference. imo, as long as you are not driving stupidly or recklessly, then you should be ok.
things to look for:
dyed film - no, unless you want to replace within the year
hybrid, fully metallized, ceramic - yes, have lifetime warranties
hybrid is a mix of dyed and fully metallized. it has another name, starts with an e, its known as e___ dyed film. its got metal content to give it the lifetime warranty. usually best if you have navigation antenna built into the window, like rear windows of acura's or audi's. nothing to worry about with the front two windows of the 4runner though.
fully metallized - no color options usually. but carries the lifetime warranty.
ceramic - best film i know of. lifetime warranty. really really expensive though.
all films provide uv protection. ceramic also gives protection so you won't feel the heat on your arm. i'm blanking on what that is right now though.
don't use any ammonia based products to clean it. the ammonia can be abrasive and scratch the film. my recommendation, an ammonia free foam glass cleaner and a microfiber towel. or a mild soapy water solution.
brands are brands. just try to stick with something that has a lifetime warrranty. make sure the shop warranties their work as well. there's many brands to choose from: Llumar, Suntek, SolarGard, Madico, etc. Ceramic includes Huper Optik, V-Kool, etc.
Ceramic takes a really long time to dry, especially in the winter.
do check your state tint laws, though. see what's legal and what's not. your choice on going illegal, but some shops won't do illegal work..