I live in a pretty high crime area and recently installed a kill-switch. Its mostly a deterrent, for a experienced thief maybe its just a obstacle. For your average thug it is probably the equivalent to Einsteins theory of relativity. Its cheap and a fairly easy job, and in my opinion is well worth the time and money. I just sleep better at night. So if anyone wants more info or talk about how I went about it just ask. Id rather avoid getting real specific about where I put mine but I basically wired it inline with the battery on the negative side and ran it where I wanted it. Its a on/off toggle switch and the switch itself detaches when in the off position, so even if a potential thief finds it, they don't have the switch.
"Man is not made for defeat, a man can be destroyed but not defeated" -Ernest Hemingway