Tested 10.6.1 (Standard setting) for about 20 miles last night. There were some noticeable improvements, with respect to confidence in turning, in my usual test area. But also plenty of room for more improvement. I still have to disengage at almost all of the same places as 10.5.
Steering Wheel: There was less jerkiness on the steering wheel, both with right-hand turns and left-hand turns. I still HATE the lack of signaling when departing lanes. This is a traffic violation.
Roundabouts: The roundabout performance was much smoother. Granted, the car still stops way back from it, before the crosswalk, but with 1 gentle press of the pedal the car seems to go in and out smoothly. I still HATE the signaling going into and leaving the roundabout. There should be no signaling!
Stop signs: Still stops too far back from most Stop signs when a turn is required, but appears to make the turn with more confidence, and did not stop partially through. I think the 10.5 (and 10.6.1) behavior is good for Stop signs when you are going straight. I feel like in 10.4/10.5 the car would get partially into a right turn and the cameras would no longer be able to see the cross traffic. Then it would want to pull into this cross traffic and I would have to disengage. On 10.6.1 the car appeared to make up it's mind and just go.
Phantom Braking: Still happens when driving under some overpasses, consistently. I also noticed it does this if there is a tree overhanging the road; I'm talking branches like 20 feet high.
Mapping: Still getting inconsistent behavior with repeated driving on the same routes. When I want to go home there is a 3 lane road, 1 opposite traffic lane, 1 left turn only lane, and a straight/right turn lane. The navigation and visualization both show the car preparing for a left turn. 75% of the time it does a good job. But that 25% the car might swerve into the right lane for no reason, even with cars present in the right lane. Sometimes it veers right into the right lane a few feet before making the left. Sometimes the car will not even enter the left lane at all. Happens in the day and the night, rain or shine. I am not speaking about the turn being unprotected, I'm speaking to the protected/green left arrow scenario.
I have confidence in Tesla that there will be improvements to the above issues, but my priorities are not their priorities. If we're lucky, we might get one more release this year.