IIRC Miel was buying a new 5er for a permanent location, and had no real experince with them.
If your dealer is somewhere close by you may want to ask either your salesman or one of the guys from service to come by and go over everything again. That initial PDI would probably seem like a whirlwind tour to a person who was not experienced with the systems. And the few bucks it would cost would likely be a lot easier than you trying to go back to them at the lot. Just have your notes ready so any items your not sure of can be addressed.