Installation proved gratifying easy. The biggest challenge was to get all the screws on the bumper cover approach. The supplied drill milled very clean holes, it all came together excellent. The box and the speakers I have housed in the side compartment of the luggage compartment, which is also home to the jack. Even with the quieter of the two possible volume is still very good to hear the sound. And one wants to move back in the waking state when parking any sleeping children not by shock. :-)
When reverse gear is engaged an affirmative beeping that indicates to me that the parking aid "armed" is now heard. The actual alarm sounds only when you come an obstacle already relatively close (less than 1 meter so I guess), which is very pleasant for parking. With an uninterrupted sound we have then 30cm air. The rear end of a park, it is a sure to thank, if you also makes this rather ascends even denser. :-)
In short:
We are happy!