I haven't published anything, as I am just learning, but I have a plan to migrate at least 3 apps (2 radio apps, 1 tool app) to flutter, when I feel confident enough. I use a lot of native libraries (Firebase, MediaPlayer, Facebook, etc.) so I also have to take care of that.
For now I am learning on how to do the custom UIs with Flutter so I can follow any UI/UX given.
However something I enjoyed was one of the radio apps, which went from 20mb apk with AIR to just 9mb on Flutter (empty app is around 4mb in flutter).