My ascent hasn't been in any accidents so the whole getting rear ended hasn't happened to me. I did notice something I thought was extremely peculiar and could be cause of some accidents. Today while traveling on the interstate with a moderate amount of traffic and ACC engaged, I noticed that the Ascent would rapidly decelerate without appearing to actually be braking when vehicle in front slowed down immediately. While I can't be certain whether it was using the brakes to slow down, I can confirm that the time between when the rapid slowing began and when the brake lights appeared to show up on the display between the speedo and tach was longer than 2-3 seconds. I always drive with my foot covering the pedals in case I feel the need to take over from the driver assist systems, and usually am not watching the representation of my vehicle on the screen, but it caught my eye when it happened today. After watching out for it on the remainder of our trip I definitely noticed it happening a few other times, and was wondering if anyone else had noticed something similar. I've seen at least 3 postings of people getting rear ended in their new Ascents either on here on or Facebook, and would love to know if they were using ACC at the time of their fender benders.