I own two cars with these systems - one Subaru and one Chrysler. I like the forward collision warning/automatic braking/adaptive cruise on both. Have had very few false alarms on the collision warning, mostly when i coast up too close behind a car turning right. I don’t drive with cruise too much, but do find the ACC is useful on long trips as it helps reduce driver fatigue. I find it most useful in both cars for stop and go backups on the freeway, both cars will just tail along 50 feet behind the vehicle in front from 0 up to the set speed. I have had the situation described by Dervman above occur. The Sube handles this OK, the Chrysler brakes a bit hard then accelerates pretty hard. I hit the cancel button when someone cuts in. The jerks do tend to cut in front of you when using ACC because it maintains reasonable following distances.

I find lane keeping almost totally useless. It’s almost always wrong when it kicks the wheel because it has misread the lane stripes. The Subaru has only on/off and I never use it, it is far more annoying than useful. It’s much better on the Chrysler, which has adjustments for both sensitivity and how much torque it applies to the steering wheel. The Subaru kicks the steering wheel in your hands as soon as you get off center in the lane (as when passing a semi), whereas the Chrysler gives more latitude and just starts gently pushing back. Not sure it’s all that useful, but at least it’s not annoying.

The Chrysler has auto stop. Mostly it never triggers, but I haven’t had any problems with it and it doesn’t bother me when it does.