Historically, Apple customers quickly upgrade to the newest version of iOS. Last year was a bit of hiccup, however, as iOS 8 required too much free local storage for many to get the software. That's changed this year but what hasn't changed is the iOS option this time around; in fact, it's slightly slower than in 2014.
Based on data from Mixpanel, a mobile analytics provider, iOS 9 adoption is bit slower than it was for iOS 8 even though Apple has trimmed down the installation files. At my last check, about 13 percent of the iOS devices Mixpanel has seen have the new software.
Mixpanel's CEO, Suhail Doshi, suspects the server loads that caused issues for some upgraders yesterday may have something to do with the pace, saying,
"iOS 9 has received 12% adoption in the last 24 hours and is being adopted similar to iOS 8 last year. This kind of adoption took Android's latest operating system, Lollipop, in comparison 5 months to achieve. One huge advantage Apple got right this year over last year was that the update is much smaller than last year (3.5x smaller) -- Apple has empathy for its users who have nearly maxed out the space on their phones. However, one issue for it being substantially slow compared to iOS 7 is that servers are having trouble keeping up right now as people update."
I'd agree that the servers surely impacted the initial pace. That problem was resolved within a few hours, so the next 24 hours may be more telling about the adoption pace.
And Doshi's comparison to Android software updates is accurate too, although to an extent, Google Play Services -- which is updated every 6 weeks through the Google Play Store -- help mitigate some of Android's version fragmentation.
I'm not in the camp of waiting to upgrade so I've already got iOS 9 running on an iPhone 6 and iPad Air. The software even changed a bit on CarPlay in my new VW as well. How about you: Are you waiting for any bugs to be shaken out or is there some other reason you're waiting?