I had the update performed today. Good news is that I was in and out in under 2 hours. Bad news is that I lost some of the settings that I had changed, and the car seems to have forgotten the code to my garage door opener. Worse news is that they dented and scratched my car just above the driver's door handle.
I am taking the car back on Friday so their "dent guy" can (hopefully) fix it. However, I have my doubts about the scratch - it's through the clearcoat (can feel it with a fingernail, etc.), so I don't think it can just be polished away. OTOH, repainting the door doesn't seem like a good option either. I am therefore afraid that I am going to have to live with an unsightly touch up job right where I will always see it every time I get in the car, entirely due to someone else's negligence.
One thing is certain: my car is never going back to that dealership again.