I paid extra for it on mine and it’s absolutely useless, normal CC on the motorway allows you to get close enough to the car in front and then pull out to pass, this system starts to brake at about 350 yards from the vehicle in front so you have to pull out way early and when traffic is heavy it leaves such a big gap that other cars just pull into it in front of you and then the car brakes to maintain the huge gap, this continues until you’re doing 40mph in the outside lane, utterly utterly useless, the only way to avoid this and make any forward progress is to override the system with the throttle pedal thus negating the whole aspect of cruise control.
The car comes with normal cruise as standard and with other cars from this manufacturer you can turn off adaptive in the settings and it reverts to standard CC, this function is missing from mine and as I can’t keep my foot on the pedal for long periods I am probably going to have to cancel my car.