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The Fibaro looks good, mounts easily, motion sensor is great, has a local DTH for SmartThings that gives you access to all it's advanced settings..... But I needed a good lux sensor and it's lux sensor isn't very precise. It can't pick up ambient light very well. In a room with just the TV on, it reads 0 (AeoTec TriSensor would read 50), turn on the light in the room it would read 10 (AeoTec TriSensor would read 200), put in a window it would read 500 (AeoTec Trisensor would read 2000).
I primarily wanted it for the lux sensor, so the precision of the AeoTec Trisensor better suited my requirements (although it has it's own downsides also). The lux sensor in the Fibaro is fine for day and night, but if you need to fine tune automations for say dusk and dawn or cloudy days it wasn't precise enough.
If I was just looking for a Motion sensor (with any of it's other features other than lux) the Fibaro would have been the way to go and worth the extra cost over the AeoTec Trisensor just for the fact it uses a local DTH.
Had alot of issues pairing using Homeseer SEL. Finally got it working, then started getting false motion detected. Motion range is also very poor, only got about 10 feet. Originally purchased to use the thermometer function, but decided it was not worth it and returned the item -- replaced it with GE 34193 motion sensor, which works great so far !
suffers slow update speeds for light sensing, probably from battery sleep mode. motion and movement are pretty quick, but light sensor updates are too slow for automation based on movement AND light levels. it's neat looking, I like the eye look, z-wave set up is easier than others.