I don't believe in alarms anymore. I had one of mine broken into several years ago, great alarm but no one paid attention. There was even a parking lot guard with a golf cart and he didn't go check it out when the alarm went off. He and the owners of the place said that car alarms go off all of the time and are more of nuisance than anything.
Talk about pissed. Not only the feeling of someone invading you but then to add insult to injury.
Insurance paid for everything but it still makes you feel violated.