I've had a ton of issues on my 14 pro, which I'm very surprised about:
Boot issues:
- First boot hung on setting up Apple ID (copied from my iPhone 12 Pro). Waited 10 minutes, rebooted
- Second boot worked and asked me how to transfer data, I selected from my Mac, and it said it was doing that, then gave me a regular screen of apps (no data transfer)
- Restore after that worked fine
Post-startup issues:
- 1password didn't prompt for face id permissions before I reinstalled it (it would quietly error out)
- All my cards were showing as unavailable in Apple Pay (had to remove them and re-add them (they showed up as previously added cards)
- My watch prompted to be copied over to the new watch, but disconnected from both old and new phones completely. After rebooting it, I tried removing the activation lock via the old phone, which said it worked, but failed. I reset the watch via the watch itself, and added it to the new phone, discovering it was still activation locked. Fortunately, you can re-activate a watch with an activation lock if you enter the email/password of the Apple ID of the activation lock. The restore then worked correctly.
My phone is was also very warm for the first few hours, but is cooling down now.