I have a DIY yale smart alarm, installed myself a year ago. Not a single false alarm so I’m happy with it. The separate IP camera in the garage pings me a lot with moths flying about and the like, but the PIR has not triggered (and yes it does work with me walking in there). Also have door sensors
Cheap and gives me peace of mind – if I hear noise at night (old house) it isn’t someone creeping about. If I come home and the alarm is going at least I am forewarned there may be a burglar in the house (unlike the time we were burgled and it was a massive shock)
I don’t think anyone actually bothers to respond to an alarm these days unless you spend a lot on a proper monitored system.