That one acutlaly works good :) I myself use a Samsung Galaxy Note in the car. I have the phone dock set up so I just plug in the device to the dock. Dock has the power cable + the stereo cable already connected. I stream music from my Spotify every single day. It goes anywhere I go. Everythings working :)
Yeah the 3.5mm stereo jack to the earplug hole. Does the car have 2 x RCA connectors or a 3.5mm stereo jack or what :) Anyways, I'd say having the dock / craddle is great. Surely only problem is that if I upgrade to Note II the same dock isn't working anymore.
The car has a 3.5mm stereo jack and usb dock..I can connect the Ipod to usb and perhaps I can use the stereo jack for my phone to use spotify. I can plug my phone into the usb only the car will just play my mp3 sounds