I can't say that I've noticed any refraction from cars traveling behind me nor being able to judge how fast or close they are. Having said that, alternating between the rear view and external mirrors views to judge surrounding traffic can be a bit un-nerving untill you get used to the side mirrors.
I'd be concerned if the window tint is bubbling. It shouldn't do these days as the quallity is quite good. The lines of the dimister are raised on the glass so i'd be carfull if they need to replace it again but if they need to, the sooner the better.
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