I LOVE my factory rear only air ride. It is soooo helpful when hauling a trailer OR just having heavy loads in trhunk OR lots of people.
I have replaced my OE bags with Arnott, just out of preventative maintenance, about 5+ years ago. I definitely prefer it for its option to level the vehicle.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S