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Contour Roam on my helmet. Don't do a whole lot with it, but it's nice to have.
Had some asshole neighbors a few years ago, dude liked to pick fights with anyone who looked at him, even if that person was wearing full offroad moto gear with a handgun under their jacket...
One incident where a jeep "didn't see me" and made a turn right into my lane... lied to his insurance co, and it took about a year before that was resolved and I got my deductible back.
Couple other close calls.
Bunch of weird shit.
Nice to have for races, when I can go back and see what/where I fucked up.