I've noticed two differences in autopilot:
1. When changing auto pilot modes, the current mode doesn't need to be turned off before the new mode is selected.
2. Auto pilot turns off with less control input than previously. This could explain why some need to recalibrate their stick to make autopilot work. (Might also need to add damping or deadzone.) Also, the "hesitation" when taking control away from autopilot is gone -- a good thing.