Max Angle... You amaze me!! I worked with that system for well over 20 years and think it's God's Gift. Every airline pilot and controller I've spoken to also thinks it's fantastic. The American crews used to rave about it. Maybe they ought to switch them off one day and let you guys get on with it... Biggest cock-ups I've ever seen in my life were pretty jolly spiffing airline pilots trying to get off the runway in poor vis when one of the green turn offs wasn't working. I actually said to one once: "Are you sure you'll be safe om the M4?"
Happy landings..