Ok, so just got home from a trip now using 12.5. To say the least it was a miserable drive. Even though I was paying full attention all of the time, I was getting nagged what seemed like every 30 seconds to pay attention. Second Major issue was that the speed was constantly drifting downward no matter if I was in auto set speed, manual set, or even if I was around traffic. Also when entering reduced speed zones, it didn't even attempt to slow down. and lastly nearly completely missed a stop sign. I probably got dinged for my insurance and Tesla insurance because I had to hard brake. interstate driving is definitely not on the v12 stack and I continue to have v11 lane changing issues where it doesn't want to change lanes making me look like I'm drunk or something. FSD, you have some issues to work on.