The sales is telling you it provides zone detection, fall detection, etc. Yes, it does. Not at the same time tho. If it's ceiling mounted, there's no zone detection but you do get fall detection. In wall mount setting, there's no fall detection but you do get zone detection. Ghosting is a problem. Interference is a problem. Detection angle is a problem. It's better than a motion detector, it's faster in response than most wireless motion detectors, reliability is questionable.
I have set up 3 of these. 1 in the living room, 1 in the kitchen and 1 in the home office. All of them monitor both presence and light and connected with Homekit. If I enter a region and it's dark enough, the corresponding lights come on, if I enter a different region, old lights should turn off. Usually this works nice but sometimes a "ghost" is left in the previous area causing the lights to stay on or even turn on when nobody is there. My partner is 5'11" and around 55kg, this presence sensor sometimes doesn't recognise her causing the lights to turn off. So it's not accurate.
App is okay, got used to it as I'm using Aqara for a longer period now. The detection zone's mimum size is 50cm*50cm (1.6feet*1.6feet).
Overall, if you're happy tweeking a bit with Apple Home (write simple scripts), it can be a powerful ally. Way better than Hue/Eve motion sensors.
To give you an example: If you don't want the sensor to turn things off and if you use light bulbs which can be app controled and dimmed (Hue, IKEA Tradfri, whatever), you may want to check if it's on or even better what's the percentage setting on it before turning it off by leaving the zone. This can be achieved by basic scripting. Allow some delay before turning everything on and check the value again before turning it off to ensure less detection errors occur. This may also give a nice extra to your lighting setup.