Got the HW3 upgrade installed today (San Rafael, CA). Dropped the car off at around 9am, and it was finished by noon. I kicked the whole thing off via the mobile app 'schedule service' exactly 2 weeks ago.
It took about 10 miles for the cameras to calibrate for the stop sign/light behavior. The navigate on autopilot lane change option still needs a few more miles to calibrate. As mentioned already, most of the settings were lost. No big deal, the only one that's a bit of a pain is HomeLink... but ok it takes just a few minutes.
Wow what a difference in the visualizations. Love seeing all the road markings... and was pleasantly surprised by the trash can visualization. It's trash day in my neighborhood, so they were everywhere. Like a construction zone in HW2.5 but with trash containers instead of cones.
This is a P3D vin 114xxx (September 2018 delivery)