Opel Agila 2008: Sometimes impossible to use so the noise is irritating. Even when it works, too crackling (especially on self-drive).
Citron C4 Picasso 2012: Its too low, background ruined by crackling.
In general the sound transmitted is low and must increase that of the car radio to compensate.
Given the price should not expect a miracle. The remote control has not worked, yet the device functioned well so I was like "okay".
But then, the unit has held 3 months. Simply because it no longer recognizes the SD card (no SD actually) and the USB port stopped working after a week.
Frankly for the price I will do my hard but be aware that depending on your car and the quality of the antenna, you will either correct gear is unusable.