I received my new phone in the evening of launch day. My plan was to transfer data from my old phone to the new one by having them sit side by side. I updated the new phone to iOS 17.0.2 as prompted, and restarted both devices. I did have to search off an Apple support article suggesting that I restart both devices to get the setup work started. Once I did that, everything transferred correctly. There were no further surprises for me.
The best part of my first 24 hours of experience with the new device is that the new phone is so much quicker than the old one to process.
I am using the Apple clear case and I find it pretty slippery in my hands. I will very likely buy a different case that lets me feel I have a secure grip on it.