We have the AP-1 and we have noticed that in firmware, v9 12.1.1 (4b1dd29), regen works like it always has, when you lift your foot off the accelerator, there is the rapid slow down of the car. But with this new firmware version, if you are using AP or if you are using the Adaptive Cruise, the regen no longer slams you. It is a more controlled decrease of speed. This has always been a complaint in my book because you must be ready to pick up the acceleration in order to not make the passengers sea sick from the rapid slow down. Now, I can be more relaxed in following up on the accelerator Great Job Tesla!