I didn't upgrade right away because I never saw an update notice (no lock screen notification or red badge on my settings app). Not on my iPhone 6, iPad Pro, my wife's 5SE, or her iPad pro. I've stopped watching the Apple webcasts since the coverage on Macrumors and other websites is generally pretty good and I'm busy
. I guess I missed the article that said iOS 11 was released. In fact, the only reason I knew to upgrade was because I happened to come by the first Macrumors article saying that adoption was slow.