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.
2014 X5 xDrive50i ZMM - Alpine White/Mocha (Mods In Progress!)
2014 Jeep SRT - 2013 Tesla Model S P85+ - Bimmerpost Featured
2013 F10 M5 - 2012 550 xDrive - 2011 M3 ZCP