Not sure if this guy is a member here or not (couldn't find his name), but wanted to share his YouTube page which has over 20 short, to the point videos showing autopilot in various situations. Extremely informative and shows some of the limitations very clearly. Also, excellent HD footage and clear view of dash and outside road. Kudos to the author of these.
https://www.youtube.com/user/NexuJosh/videos
https://www.youtube.com/user/NexuJosh/videos