There’s a motion sensor on the Kuna camera at our house, we’ve had two false alarms in 2 years, and no apparent missed alerts. I’d consider that working fine. 
We also have a separate security system With motion sensor cameras that has had no apparent false alarms in six years.
And we have a separate set of path lighting using Mr. beams. It’s had a few more false triggers than the other two, but no more than five a year.
Nothing’s perfect, but I would consider all of those OK.