Yohans may be able to confirm or deny, but I think there are issues with the comfort access, the owner of BMW car magazine here in the UK has a M3 with it, and it keeps flattening the battery.
IIRC it's to do with keeping the key far enough away from your car when it's parked outside your house, apparently if they're in range, the car can't shut down properly, leading to a flat battery.
Google it you might find out more.
Mike
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