i didn't use the kill switch for the unit. i don't think it's really necessary honestly. if my QS actually did screw up, i can access the wiring through the trunk and just unhook it.
i haven't weighed the bike, and i don't really care. but its maybe 30 or 40 pounds underweight. what matters most is the way it handles with the light wheels. so maybe full of fuel it's 440lbs? maybe 435? not sure.
the arka carbon cans are definitely lighter than the lbp ones, but they are also 100mm shorter. a bit louder if you remove the inserts, but i ride with the inserts in and it's very quiet, i love it. i can hear more airbox than exhaust, which is ideal.
it's quite easy to burn your boots on the pipes, but you get used to them being there and it becomes less of an issue. positioning of the rearsets can help with that as well.