I bought and installed the system for my E38. The music playback function as described - the sound quality is very good for a car.
However, off the voice since the installation of my Navi. I can not rule out that I have connected properly when installing all contacts of the connector.
Definitely but interferes with the device the Navi when I run it in his CD mode - then the Navi display on the screen is constantly off. In radio mode, everything works again.
So I can not listen to MP3 when I use the Navi - therefore three star point deduction
Sunny greetings