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 still both contained in the Text section, but they both now load instantly which it never did on the 4s.

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 the appear on the iPhone.

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2013 X5 35i M Sport