Welp, got the full experience of the advanced forward braking system yesterday. I have mine set at the furthest distance so i've gotten the 3 beeps a couple times but never gotten to the point where the truck takes over. I'm a also not a tail-gaiter so likely why it doesn't trigger too much on the far setting.
Basically dry weather, daylight, driving on a 45mph town road. And we were doin about that. 2 cars ahead of me, and it looked like the one in front of me was right up to the one in front of them. Pretty sure what happened is the person 2 cars up, brake-checked the person in front of me, but i had looked into my pass side view mirror and out the window for a sec at that moment so I'm not sure. Anyway, i heard the beeps and took my foot off the gas to go to the brake as i turned to see what was happening and before i could get to the brake pedal, the truck was like "nope... we're doin this NOW." and locked 'em tf up... and i say it that way because it wasn't like jamming on the brakes and getting the abs... it like nosedived and screeched more than i would have expected. Seemed to let up when i did get on the brake pedal, but i was not expecting that. I was able to stop with what i would call a pretty ok amount of space between me and the car in front of me.
So if you want my yelp review... 5-stars... it works... I took her for a wash and a full tank o gas right after the adrenaline wore off, for saving my bacon.