iMessage no longer working with 9.02
imessage is no longer saying delivered but the recipient receives it. They later receive it as a duplicate text message as well. See this forum. It's been in the last 24 hours for several people.
https://www.reddit.com/r/ios9/comments/3nr696/bug_imessage_not_saying_delivered_ and_sending_as/
iPhone 5s, iOS 9.0.2