Stick plugged into the USB slot, phone cable plugged into stick and AUX socket of the car, Bluetooth on iPhone activated, connected to the drive, finished! All went in under 60 seconds.
With a second iPhone, it works well, but must then be reconnected. That's not very comfortable, but doable.
The audio quality is fine, I hear no difference. Very rare jerky sound (once per hour), but this may well be the older iPhone 4 my wife. The adapter of Hyundai has since made much more difficult.
I hear on Spotify and the Bluetooth adapter to my music in the car, perfect!
All in all, the price is very low and the new feature pure luxury, if you have an older radio without Bluetooth.