I've been running Llumar safety and security tint on my Tacoma for years and years, first an '07 and now my '15. I am interested in both security and UV blockage, so I treat every piece of glass on the entire truck and rear shell. My Taco comes with rear side and very back factory tinted (double cab short bed), so I add clear film to the inside of those. Any glass that is not factory tinted gets 50% tint, including the front sides and front windscreen. Never had an issue with visibility, glare, flare, etc, and driving with automatic sunscreen is awesome. I've only had one instance where a lurker in a parking lot watched me walk away ttoward a store, then attempt a smash with what looked like a convenient thrown rock. Just bounced off the glass, very entertaining, as I was able to watch him in the store window reflection. Set the alarm off and he ran, no issue at all with the glass.
The safety films go on just like regular tint, on the inside with a squeegee, they are just tougher and thicker film than normal tint. Most come in anything from full clear to limo black, and shades in-between. All block 98% or so of UV (I think both A and B but not positive on the UVB).
Safety note: not only does it deter theft, but it will definitely slow down EMS responders trying to save your ***. Full axe swings don't do much to the glass, but with enough work (minutes) you can break thru slightly to open the door.
Visibility note: awesome for not getting blinded during early morning sun, hardly need sunglasses most of the time. With all my windows 50% (lets in half of available light) dark parking lots that are not lit are hard to negotiate without headlights on, so if you drive in the dark without headlights I probably would not recommend it. For normal driving including fog, rain, snow, night , etc, I don't have a problem. I've loaned my truck to family members and no one even knows they're not factory tint or factory clear, including my local LE personnel for almost ten years now.
3M also makes similar security film, as I think Llumar discontinued their line. Google the Llumar video, dude with a rock just wailing on a car window with little effect for quite some time.
Bottom line, highly recommended, will always instal on all my vehicles, and I have yet to find a downside.