+1 on the weight, the balance shift, and the obstruction on your helmet in case of a crash.

RebeccaC, I have the opposite question: where do you live that motorist harassment is not an everyday occurrence??

I would pay the extra money for one of those remote cameras, so only the Sharpie-sized camera is on the helmet (so it looks wherever you look) and the guts of the camera are on your body. Like cops wear, or like they mount on racebikes. That's the only way I'd consider it. You'd have to get used to unplugging the cable when you take your helmet off, but that's no different from, say, electric gloves or hardwired electric vest or the like.