So the price to add "Autopilot" to my six-month old Model X appears to be down to $2000. Can someone explain exactly what features that would give me? I gather it can do highway driving, and maintain the distance between me and the car ahead, like Adaptive Cruise Control, is that correct? That alone may be a good deal, but what else can it do? A lot of what I found when I looked on-line seemed to describe previous options, not the current two options "Autopilot" and "Autopilot + Full Self-Driving Capability". The Tesla website is clear that Summon, AutoPark and Navigate on Autopilot are in the FSD package.