You're right, I've only called them fakes to emphasise the point to BMW. I know there are many happy customers here, and if I'd bought them myself I'd be happy too. As you've said, they look great.
But, I paid a premium to buy from BMW AUC and to have genuine CSL's, and a warranty for everything on the car. If something happened to these wheels, my local dealer would not touch them as they're non-bmw parts. Also BMW are not supposed to sell cars with non-BMW parts on them through the AUC system. I also presume that they're not as light as genuine's.
I'm glad that I appear to have a good dealer and salesperson dealing with it. Let's see what they decide...