Design and feel are okay; snapping on the mounting plate is not as fiddly as with other devices. The maintenance-free with the 10-year battery and the test at Warentest were decisive to buy for me.
The only catch: It seems that there is no final inspection by the manufacturer, so we had with a defective device. So: When unpacking TEST! Simply press down the strap on the back and while pressing the test button briefly.
