I have a full security system and would not be without this.
I live with the dogs however am not frightened at night as I arm the perimeter of the house.
It is an excellent system and does not go off by mistake for no reason which happened a lot with my last one -=admittedly this was in the country and we had one of the big sheds alarmed and had water rats so they probably set it off.
Also connected to this type of system is an alarm which does not rely on batteries.