I once rented one of those Golf at the airport, didn't like specifically the Golf ACC (possibly it could be somehow tuned/set differently) because - at least in my case - while driving on the leftmost lane it could "see" a car merging on the leftmost lane (to overtake someone going slower) at a too big a distance, immediately slowing down even if it was unneeded, really plenty of space before my car, then re-accelerating to the set speed as soon as the car in front returned to the right lane.

In slightly heavy traffic conditions on the highway it was unpleasant/confusing.