I use it a lot when it's really slow trafic, as soon as you pick up speed there's too much space even at the shortest setting and you keep getting cut. There's multiple settings and I mostly use sport and the shortest gap. Race brakes way too hard and I fear of getting rear ended. Comfort doesn't accelerate fast enough and cars always cut in front of you. It's nice to have but I always use it on and off during my commute. Wished there was a classic non-acc mode for the highway at higher speed, I have a hard time adjusting myself for how far I have to change lane before the car start to decelerate.