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I can help out here - I ordered them on my 520d.
Basically, it's an extension of the dual zone air conditioning and you get the following 'extras' with it:
Fully automatic temperature control with independent temperature control, air distribution and air volume control for drive and front passenger. Two vents in the rear console. Including Automatic Air Recirculation (AUC), solar sensor and fogging sensor and auxiliary ventilation.
I ordered it as I'd like the auxiliary ventilation (can set a time for it to come on) and the parked residual heat function. The fogging sensor will come in handy, although to be honest, it's not like pressing a button to do it manually is that much hassle!
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