I have 8 of them and while yes very expensive the value over time will hopefully be worth it. These are roughly ten year devices after all.
When a smoke detector goes off, I've got my system set to: 1) Turn off HVAC/heat 2) Unlock exterior doors 3) Turn on lights 4) Flush syncs of any local data to remote sources
What's the google price tag for again? Initially it was worthwhile for the panicky waving motion to cancel alarms. But then they removed that.