you all posted some great info and I will tweak my adaptive cruise settings. i have avoided it from the issues many of you complained about.

For the Audi Pre-Sense, my car jammed on the brakes twice and it does scare the crap out of you. The second time it happened, I was approaching a car in front of me that was slowing down to take a right turn. I didn't bother slowing down knowing the car would be out of the way shortly. I think the pre-sense jammed on the brakes because i did not have my foot on the brake at all. that would make sense even though annoying. so I try to keep my foot on the brake slightly when i confront a similar situation. But i never had any issues with curbs like some others.