2nd i wanted to use the my Galaxy S4 with the Car stereo with inbuilt ipod support, this cable does not help in that, the car system cannot detect the device. And second negative here
So the cable is just another redundant investment for me.
Most docks also support Audio in thru a 3.5 mm headphone jack, use that instead. No use investing in this Cable if the Samsung galaxy S4 can be read as an ipod in the dock.