i have a 2 way alarm that will page me if some1 even touches my car, it reports if the door has been opened, or hood or trunk or if the engine is started.
makes me sleep better at night.:)
i also have lo jack installed, so if i will receive a page that the door is opened or smth like it, or that some1 banged the car i will just call the cops. i would not go outside to get shot or stabbed.:) oh and another thing, if your car is garaged it decreases the chanse of loosing the car drastically.