I feel that those ordering tomorrow morning will have an easy time of it. I don't see much demand. Many who do upgrade will be those who have a specific need and interest in the iPhone cameras or those who have an older iPhone model.
It wasn't bad, the site didn't go down, everything went smooth.
I would probably jump ship to android if not for all the other apple products I have and how they work together. MacBook Pro, Ipad Pro, Apple Watch, air pods and iphone. In addition to all the money I have invested in apps, unless they put out a dog...I'm probably on the apple ship for quite sometime.