I've never written an actual ticket for tint. Mine is at 20% and I'd feel like a cockbag telling someone else they can't have what I have. Also, around here anyway tint meters are scarce so I'd also feel like a cockbag for saying someone's tint is too dark based on how it looks. Oh and to whoever was asking about a record, its a non moving violation. That doesn't apply to your driving record.
Just an fyi. Having the shade open on the sunroof really helps you look like you are not under 35%. So just pop that open when the fuzz is around. Other officers I work with aren't big on writing for it either. A lot of warnings, but no tickets, but as other threads have pointed out this apparently is the exception and not the rule.
As for having the guns out, well that is a precaution unpredictable acts of violence during a traffic stop are a bitch you know. I usually just use the loud speaker and ask the driver to roll em down. No one hasn't complied yet.
I paid for 20% all around with nothing on the windshield, and it meters at 14%. I don't have a problem at night, I mean it's noticable but I wouldn't call it a problem. Its looks like what your rear view mirror does when it polarizes.