Well, i'm in the South East Suburbs, and generally we've only had 1 car broken into and that was a old Nissan Pulsar. At the moment we have about 3 cars sitting out the front of my house including a VL Commodore, R31 Skyline (My baby) and a Mitsubishi Lancer CE. Apart from that we generally park our cars on our front lawn during the night time and keep the Lancer in the driveway so if we hear anything it is generally easy to run out the front and smash them over the head with a wrench. It's fairly good having parents that wake up over the tiniest of noises, . But yeah i guess as long as you take your head unit with you every night when you go in or your head unit is the firmly locked in ones you should be ok, .