I am really enjoying the ACC in my ‘20 HC. I was waiting for GM to offer adaptive cruise before I updated from my ‘06 Sierra SLT, and I am happy with it. I learned to love ACC by driving my wife’s fully loaded 2012 Jeep Grand Cherokee- it has radar based ACC and it works well. The new truck’s camera based system is pretty much just as good so far, though I have not tested it in heavy rain or fog yet. But one excellent feature that the truck does that the jeep did not is full Stop and Go without using your foot! I was following a vehicle on a highway, and my truck maintained the following gap as it slowed from 65 MPH to a full stop at a stop light, remained at a full stop for several seconds, then when the preceding vehicle got a green light and continued, my truck started back up and accelerated to maintain the set following gap Once again up to 65 mph. The jeep would have cancelled the cruise at 25 mph or so and hit you with warning lights and maybe brake slam. The truck is perfectly happy slowing you to a stop and then going again. Good job GM! Now we just need hands free lane keep so I don’t have to hold the wheel either.