This is the best point. Police officers I have talked to advised against using the "Protected by ____" signs and use a generic "Alarm system installed" sign so criminals wouldn't have an idea what you are using. The best criminals can get into anything, and if you tell them what system they're using it's just going to make it easier for them. You can have one of these "cheap" systems but it may take the criminal just as long to figure out how to break into your house "safely" if they don't have that knowledge before.