ACC is greatly appreciated by me as I drive in Toronto, Ontario traffic up to Barrie, Ontario. As the original post stated, the Pacifica ACC does it all for you. In fact the only concern I have is when I do depress the brake and the ACC is then automatically disengaged. If you forget that you touched the brake and that the ACC is disengaged then you "think" erroneously the vehicle is going to slow your vehicle down... oops! In any case I love the ACC feature. The noise I believe the second poster is referencing is normal as the special motors are engaged to apply the brakes.
2017 Pacifica Limited
Red, Fully Loaded 8-Passenger