We got our model 3 about a month ago and navigate on autopilot was the number one feature I was excited about in the car! We have done about 1800 miles in the last month almost completely on the highway around southern California. Navigate on autopilot is a terrible driver. The auto lane changes take so long that drivers in the new lane close the gap before the car moves over. It doesn't seem to have any awareness of the speed of cars behind and in front of you. It'll change lanes when the car in front of you slows down by about 1 mph, but it will change lanes into a much faster lane cutting off cars coming up behind you. It takes so long to change lanes that it almost always fails to actually make the change. I have to disengage for probably 80% of lane changes and exits. For off ramps it slows down about 200 yards before the actual exit which causes cars behind you to almost hit you. Many of the roads (not primary highways) around me are 55-65mph but the maps don't have the speed limit data so it maxes out at 50mph which is an unsafe speed on these roads. Autopilot even drives like it's drunk on about half of my commute. There's a ramp about every mile, but the lanes are a long merge area and the car tries to center itself in the two merging lanes. This happens every mile for about 15 miles of my drive. It makes passengers sick from the constant weaving in the lanes. There have been many times when the car thinks it needs to change lanes to follow the route but it is completely wrong. I cancel the change and 2 seconds later it tries to change lanes again. Repeat over and over. I've got to the point where I never use navigate on autopilot and I'm only using autopilot on straight open roads with little traffic. Autopark is completely useless. I've tried it out in a controlled parking lot in a lot of different parking setups, parallel parking, garages, and lots of other places and it never has once successfully parked. Navigate on autopilot is making more work for me as a driver to correct all of it's issues. We bought into navigate on autopilot with the dreams that someday it'll make my commute totally autonomously, but I don't see that happening for many years if ever with this sensor suite. Thank you for coming to my TED talk.