For the reasons most have specified I opted to not order it on my M5. On my 550 it was merely a conversation tool. Rarely, if ever, did I use it in real driving.
Audi's implementation in the instrument cluster is better, but until it's visible in the HUD I won't be ordering it again from any marque.
Alpine White · Sakhir Orange Full Merino
Executive · Driver Assistance · B&O · 20" HRE P40SC · Akrapovic Evolution · H&R Springs · Many Euro Mods