I've been monitoring for messages about upgrade experiences. I haven't seen any, so I took it as a good sign, and forced the upgrade to run.
I am happy to report that it went flawlessly and was FAST. It took maybe 5 minutes? Definitely no more than 10. I was watching the update status progress in my browser. I was very surprised not to experience any errors, as I watched the 1930 switch my desktop is plugged into go dark during the upgrade and then come back to life. Not a single hiccup seen. I have a total of 9 devices - 6 APs (AP22D, AP25 and AP27) and 3 switches (1830 and 1930).
Congratulations to the HPE-Aruba team on a job well done!!