Used Nav on AutoPilot again yesterday and this morning. Here are my experiences:
Yesterday Nav on Autopilot worked as I imagine Tesla envisions (290 from Laramie to 3800 Independence in Chicago). I engaged NOA as I entered the highway onramp. I was asked to confirm a merge onto the expressway (note, this merge is a combination on-ramp from Laramie and off-ramp to Cicero - this may be of importance). The vehicle stayed in the right lane for the three miles or so to my exit. It could have changed lanes to the center lanes to maintain my speed, but it did not. I still have the speed set to aggressive, perhaps I will try Mad Max to see if this changes this afternoon. When I approached my exit, the car signaled and took the exit as expected and then disengaged NOA, leaving me with regular autopilot (this exit was a single exit, not combined with an on-ramp). It came to a stop at the car in front of me at the intersection.
This morning was a different ball of wax (90 from Diversey to Laramie exit on 290 in Chicago). I engaged NOA on the onramp from Diversey. The merge was a simple on-ramp style merge, and the vehicle merged onto the expressway without signaling. The car stayed in the right lane, and significantly decreased its speed as it approached an off ramp on the right. Not sure if the GPS thought I was in the exit lane, but it began to slow as if that were the case. I manually switched lanes to continue my trip at my preferred speed. As the car approached my interchange, I was prompted to switch lanes to the right, which I did without issue. Despite the interchange from 90 to 290 being under construction, the car handled the interchange. It also notified me on the IC that construction was detected at that NOA capabilities might be diminished. The merge from 90 to 290 is EXTREMELY short, and I was nervous about the cars ability to handle it. Luckily there were no vehicles to contend with and the merge occurred as expected. There is a construction divide in the highway, and I believe I accidentally disengaged EAP by trying to coax the car right. As I approached my exit, the car disengaged NOA (as it did yesterday) and I had to manually exit (this exit was a single exit, not combined with an on-ramp).