I myself have had the misfortubne of people messing wiht my property. I am seriously considering an alarm, even though the only real things of value i leave in my car are CDs. I will shortly be adding a rather expensive sound system to my little green car so I will have to soon. I suggest you look into one also. They even have some pretty new ones that can detect if a window is busted, even if nobody completely enters the vehicle. My boyfriend suggested that type to me after he had his entire system except for the head unit literally RIPPED out of his wheels. He drove an SUV at the time and they smashed the back glass and pulled the subs, amps. and boxes all out even though they were bolted down. I guess security has become his specialty since that happened. I know youa re mad now....but maybe this experience will save you from losing something of even more value down the road. My car has permanent key scratches all the way down the driver´s side because somebody decided that it would be fun to ruin my paint job. Trust me... I will feel a lot better when my alarm is installed. :-?