Overall, very satisfied with the product. Can summarize my thoughts:
+ The installation was super easy and simple, both to install it in the ceiling as well as the wifi and app installation.
+ Discreet design. Looks like any fire detector. Fast maybe a bit more high tech :)
+ The actual function in it, you have a fire alarm and some other nice things it can warn for.
+ Is compatible with a few other home automation systems, such as Philips Hue.
+ Support for both battery and power supply. Why you would like to have the last one I think is a little strange, if it's burning now. Perhaps switching on battery then, do not really know.
+ Long battery life. Have had my now for over 1 year and seems to be no strange things. The battery level is monitored and I find out if it starts to crash. Nice compared to conventional fire detectors that start to rub it badly.
+ Various automated monthly tests that you are notified about via the app.
+ You will get a monthly report via email about what happened, even the tests mentioned in the above point (if only the app was as well designed as these emails I would have been happy - see more comments below!).
+ Motion detector activates "pathlight", also logs how many times someone passed by. This fits my needs well, as it does not register * who * who have been there, but that any movement has occurred. Feeling safe to see if someone would have been in the shelter when you're not home. Fun with statistics also in general: p This feature I have only activated at night and night time.
+ Can enter emergency number to be contacted if something would happen, such as a neighbor.
+ App notifications when something really happens. Got a notification when I fried halloumi a while ago ... but I was at home so I could dismiss it. Instead of starving, I received only a notion that it was known for some smoke development. Do not really remember if I could just click it off, but nice that the alarm did not just start to tickle as many oldschool variants had done.
+ It can talk. In different languages too!
+/- The app is not so logical. It has flaws and does not feel 100% intuitive.
+/- "Pathlight" that can be set in different brightness levels, is too weak to really light up the hall for example. But it works at least and gives a certain indication of where to put your feet. I've got a good deal of thanks, better if you do not have it and / or it's a cool black space.
- The price is quite high. For a fire detector with a little lull-lull like :) But, as with anything else, it tastes so expensive.