So far, it seems pretty seamless.  
I guess that with a couple of years working on a production app in Kotlin, I would have to discover some hairy corner cases though.<p>What helps a lot is that the kotlin team has written many helper methods allowing a better flow between the android API and kotlin code : while you don&#x27;t need it in order to get interop, it allows to more easily write idiomatic kotlin code while interacting with Android.