I know its standard on most BMWs in the NA now. In HK they still charge USD 3500 for it as an option, so I didn't order it.
My last car, 335i had it. It also an option (about 1000) and all the cars on the lot had it so I got it since I didn't want to wait 3 months to get a car without it.
When I had it I probably remembered to use it like once a month if at all. I never fully opened it, because didn't want dust in the car and always either had heating or AC on.
What is you take on the sun/moon roof?
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