Perc
Very Odd Looking Vehicular Object
This depends on the situation.Don't see the point, also chances are I don't want to match the speed of the car in front of me, I want to go around it.
If there are several lanes to choose from, just change lanes. The ACC will realize the road is clear and accelerate up to whatever speed you asked for when you set it.
If not, you can always use your right foot to override the ACC. That's what you have to do when a car is braking in front of you to turn left into a driveway and there's room on the hard shoulder to pass. I found out last week it throws the anchor when you're trying to aim for the gap.
Like I said I live in a smallish town in a sparsely populated country, so the killer feature for me personally is having my car follow whoever is in front of me when I'm trundling down the road. Bumper to bumper is very nice but still (a close) second place.This is personal opinion of course, so take it as you will, but I see little value in ACC that can't do stop and go traffic.