Its bloody good if the speed limit is say 50kph as all suburban side streets are now and you happen to creep up to 60 kph, which is so easy in these, the voice over will soon inform you of the correct speed limit for the zone you are in, comes in handy if you are inclined to start your run early when you see a 80 kph or higher posted speed limit up ahead and your in a 50 kph zone, We are all guilty of doing it but Get caught doing that even with no other cars around , 30 kays over the limit, hefty fine $$$$ and for some, kiss your license good bye !
Just on a side note, its like having your Mother inlaw sitting in the back seat watching your speed down to a tee,
if its going to give you the shits dont activate it