I was on the last day of my 7-day deposit period. I was really excited about the car. So I took my friend to a local Tesla store and we went for a drive. AP was engaged. As we went up a hill, the car was NOT slowing down approaching a red light at 50 mph. The salesperson suggested that my friend not brake, letting the system do the work. It didn't. The car in front of us had come to a complete stop. The salesperson then said, "brake!". Full braking didn't stop the car in time and we rear-ended the car in front of us HARD. All airbags deployed. The car was totaled. I have heard from a number of AP owners that there are limitations to the system (of course) but, wow! The purpose of this post isn't to assign blame, but I mention this for the obvious reason that AP isn't autonomous and it makes sense to have new drivers use this system in very restricted circumstances before activating it in a busy urban area. Last, but not least. I cancelled my order until I know more about what happened. The salesperson was very understanding and apologetic. When I called later to make sure it was cancelled, they said they were aware of my salesperson's notes in the system, but didn't mention it until I asked and only after asking my why I canceled. They promised to send me an email confirmation of the cancellation. It didn't arrive. This evening I received a call from Tesla. They wanted to know if I wanted to cancel(!). The person was totally uninterested in the crash, even after I asked if she knew about it (from the system notes). Totally flat. They sent me a cancellation email, but didn't specify that the deposit would be refunded. This isn't cool and I cannot believe a company with this much positive P.R. wouldn't have moved this way up the ladder immediately to make sure that someone who'd already ordered a car and was introducing a potential buyer was taken care of. Just my .02. I really am excited about the car and don't want to throw away months of research because of this incident. Tesla needs to address this.