Great improvement from FSD11.

The control and overall driving experience have improved significantly from version 11, the ride is far smoother. However the automatic speed control setting sets the speed too low when no lead car is in front. Will consistently go 30 mph on a 45 mph speed limit road.

Worst update ever. My car crashed into a parked car next to it while being summoned whilst on this update.

FSD v12 is amazing, but the automatic speed set thing needs more work. It goes 10 over the limit or 10 under the limit, but rarely chooses the speed I would actually want. Still, the overall capabilities in v12 are amazing. One thing I absolutely hate though is v12 is forcing single-press FSD activation in my car. I had a Model S loaner the other day which had v12 and it still allowed single-press for TACC and double-press for FSD which I would prefer.

Major improvement over FSD 11

Car drives like a human now. No more jerky corners. It accelerates faster from a stop. Bad feature now is it will drive anywhere from 10 mph below the posted speed to 10 mph over. The car decides what it wants to drive. No settings can be changed to make it drive like v11. Car is also missing speed limit signs.

Improved behavior on highway in most situations (still tends to linger in left lane more than I would). Regressions on surface streets, particularly those with higher speed limits. Does not hold set speed. Lane positioning is a bit better in some cases but still plenty of room to move left if turning left or right when turning right allowing others to get past. It doesn't feel 300k lines of code different.

Significant update. Very smooth and confident. It’s just going to get better and better with more training data!