Hi,
Mine alarm isn't that briljant but I think I will work when the time comes and someone will try to open my door. The trick is to scare/suprise the burglar with something he didn't expect.
I have a couple of low costs door sensors:
http://www.domoticz.com/forum/viewtopic.php?f=17&t=2179
I hooked up my PI to telegram and made blocky events that when the door opens, and the alarm is on, it sends me a message(so I know something has happend). Every light in my home goes "on" when the alarm is triggered and my PI "says" the police is being called
http://www.domoticz.com/forum/viewtopic.php?f=21&t=2573
I am now testing the geofancy app with my system so when me or my girlfriend leaves the home the system automatically switches the alarm on.
I am also thinking of adding a sirene... but the last thing that I want, is my girlfriend coming in and having a false alarm and waking the whole street. So this will be something to discuss
Girls and domotica doesn't go so well sometimes

RPI 3b+, PiFace 2, RFcom, Aeon Zwave USB, Aeon Home Energy Meter Gen 5, several Shelly switches, several ESP8266 sensors.