I haven't tried the BMW ACC, but assuming its similar to that on the Audi A8, I particularly liked the stop n go feature. I also liked the emergency braking, which would engage the break to minimise any frontal impact once it was unavoidable. However, since I only cover 6k miles a year, ACC had to give
WRT speed limit display, you may well be right to ignore it. I had the same attitude when I read about it, now its one of those things ill want to spec, which means I'm more out of pocket for a feature I wouldn't miss if I'd never experienced it :/
With dual zone CC, the rear console still has the two vents, it just doesn't have the temp controls. I can take a pic if there isn't one on the BMW site.