I've had an alarm on my UK property for over 20 years and I can't remember it ever going off in error. I deliberately set it off a couple of times a year just to make sure it still works correctly.I've never had an attempted entry to either the house or garage yet (touch wood), but my immediate neighbour, who doesn't have an alarm, has been broken into twice. Also quite a few houses have been broken into in my street, none of whom had alarms, yet I don't know of anyone near bye with an alarm who has been broken into. It could be that there is an alarm bell displayed prominently on the house, so a dummy bell may serve the same purpose. With regard to the alarms frequently going off, I think the main problem is the motion sensors which also react to heat. I don't have any motion sensors on my system and have never had a problem.