The iPhone 5 seems to function better than my 4s in several areas. Obviously the docking tray no longer works, but the new Lightning to USB cables functions perfectly. Pandora, Music all work as before. Bluetooth seems to function better, specifically the Office functions finally are working, both text and email. They are both still contained in the Text section, but they now load instantly which they never did on the 4s (w/ iOS 6). It will only display the first few lines while driving, but the voice will read the entire email or text. The main improvement is speed, they load as soon as they appear on the iPhone. Siri also works via bluetooth audio. Overall the transition to the Lightning cable hasnt seem to have affected newer vehicles, at least the BMW models with latest Combox.