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I have one. It stays cracked open in the vent position - helps with fresh air circulation in the car. On sunny warm days I open it all the way.
Unless you use Webasto. They are very good.
Been thinking about this myself. Currently speccing the M135i and cannot make up my mind if I want one or not. Always scared of leaks etc, but is so nice when they are open in vent mode. Also, scared it will be like a swimming pool. Nice for the first couple of months and then just become a hassle or sumin I am paying for, but do not use.