These types of home security systems are more a deterrent than they are anything else. In fact, the ONLY reason I think I'd personally invest in would be automated alerts for fire or emergency situations.
If someone wants into your house, they will get into your house. There's giant glass windows in most homes these days and door locks are hardly much more than a speed bump.
All you should look at ADT for is simply making you not the easiest house to get into. But if someone wants into your house, a security system is unlikely to be something that stops them.
Edit: to be more clear, I think the deterrent part is the equivalent of putting an ADT sign in a window or nearby. THAT is the deterrent, not the system itself.
If someone wants into your house, they will get into your house. There's giant glass windows in most homes these days and door locks are hardly much more than a speed bump.
All you should look at ADT for is simply making you not the easiest house to get into. But if someone wants into your house, a security system is unlikely to be something that stops them.
Edit: to be more clear, I think the deterrent part is the equivalent of putting an ADT sign in a window or nearby. THAT is the deterrent, not the system itself.