Just returned from my first (and hopefully last) service appointment, having Tesla take care of a few alignment issues from delivery. I'm very happy with the results!
On delivery (May 1), there was trunk misalignment, contacting the tail light assembly, hanging past the bumper, and making some noise while driving. I also had a badly misaligned rear passenger window which they had improved on delivery day, but I took back for better alignment.
I used the Watertown service center to get a sooner appointment scheduled. They didn't provide a loaner for just 1/2 day service, however they provided me $100 daily uber credit while my car was there. The results are quite good! The rear hatch is much better, flush with bumper and they touched up the paint underneath where it contacted the tail light assembly.
I will note the left/right sides of the hatch do have slightly different gaps between it and the quarter panels, but it's not obvious without measuring and you can't see both at the same time anyway. I think it's the best they can possibly do knowing they can't move other panels around like puzzle pieces, and I'm completely happy with the outcome.
The window is now perfectly aligned with the trim. I also asked in the service tickets if I should have received mudflaps at delivery, and they went ahead and added the front mudflaps for free. Headlights were also aligned (using wall method apparently), but I have not tested them yet.
I also really liked being able to monitor the service dashboard from the app and click into each to see the log of details. I noticed they were on the last piece as I was finishing lunch, so I summoned an uber to head back for pick up. I didn't have to go in and sign anything, just went straight to my car after receiving the message it was complete.
Here are the before pictures from May 1: