I do find auto pilot works OK - Its a fun thing to engage and the car has always behaved itself most of the time, but haven't been on a motorway for some months until last week. I have the car set to "speed Limit" rather than current speed and mad max. I found the car recommending a lane change to overtake a slower vehicle in front just a bit optimistic considering how close cars were in the lane i was to change to. The lane would turn blue and the car was waiting for my indicator to confirm the change of lane - a check in the mirror suggested to me the cars in that lane were a bit too close to make the move and would probably cause them to slow down as my car doesn't accelerate with any gusto on AP - so i waited until there was a decent gap before engaging the indicator.
The lane changes were all good and no phantom braking - I was impressed though at my exit - the car had already moved back into the first lane and as the junction came close the car automatically indicated and took me off the motorway. The indication to exit was far later than i would drive though - I tend to indicate as I pass the first exit marker board - the car did it after the last marker board.
Now it may be because I'm old but my style of driving since i retired is a lot more sedate than it used to be, probably because I'm never in a rush or driving to a timeline - and to be honest I know my reactions are not as sharp as they used to be so i tend to relax a lot more nowadays, indeed I tend to have the car on TACC, set at speed limit, the car to follow at 6 car lengths and sit (usually) behind a truck in the first lane - only going for an overtake if the truck drops much below 60 - its the most relaxing drive in the world.
The only comment i really have regarding full self drive AP is that it drives a bit like a learner, not dangerous but makes some rather immature decisions or road positioning and makes me look like a silly old bugger - and I take pride in the way i drive. Great concept and seems to be improving as time goes by but i doubt the car will ever achieve FSD with real competence, but i quite like what i have and not disappointed.