I had thie part replaced on my X about a year ago. I kinda wish now that the X had a switch/option where you could switch the power to be 100% at the rear only (for good weather condition driving of course) as I feel that would make the truck a lot of fun on a different level.
I pondered leaving the stepper motor broken for a few months, but it happen to GO in the middle of our winter here, and I bought the X to deal with the winter/snow here Glad I bought it though. Love the heck out of it. If it had of stopped in summer, there would be no way I'd fix it until winter. I'd love a rear wheel drive X5 (as long as no other systems were negatively affected * taking note of the ABS/DSC systems being deactivated)

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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