Hi KingFrog,
I had a similar dilemma and ultimately decided on Black. Now very glad I did, as the attention is still a bit too much for my liking. All the enthusiastic fans are fine - it's the police that can get quite annoying. Already been pulled over for the license plate thing, but also have had 2 more cops pull out and follow me, waiting for a slip up or excuse. All inside the first week. Yes, in any colour the car is striking. However, McLaren Orange is very loud and I have to imagine the attention will be amplified. Certainly the copper standing at roadside with his radar will snap to attention when he sees the Orange missile coming. In fact, my dealer was already nabbed in his MO demo car.
Still love the MO colour, though. There is a definitely a McLaren Orange car in my future, but it will be a track day special, not this 12C which has to serve duty as a daily. As a consolation, my CCB calipers and interior stitching are MO, which is very nicely done and has me harking back to Bruce in his CAN AM monsters!
Surprised nobody(?) has ordered Sapphire Black. I would think it would look awesome with orange accents, as blue and orange are complimentary on the spectrum.