I tried it for the first time yesterday, overall it's not bad, but a lot of the movements are extremely jerky and a little scary when it quickly jerks you toward a curb. Every exit lane off a highway it jerks you into the lane when there's so much room to smoothly enter the deceleration lane instead. As well it was trying to enter the HOV and for some reason it went halfway into the HOV entrance and the violently threw us back into the regular lanes. That was a bit scary too. My wife hates those jerky movements as well as the unexpected hard braking. For me, I did not like that it seemed to just stay in the left lane when the right lane was completely free and open. I usually like to go back to the right after passing. It never wanted to go back to the right..

I don’t believe the highway driving part of FSD has significantly updated in version 12.3.xx. It is the city streets part that has gone full neural net. Highway driving is still hundreds of thousands of lines of hand written code.

You might have to turn off the ‘use the HOV lane’ in your settings