Check out my new article about simple android app using coroutines: https://blog.elpassion.com/create-a-clean-code-app-with-kotlin-coroutines-and-android-architecture-components-f533b04b5431

Great job. One thing that is worth mentioning is related to this comment: "In particular once constructed observable operator chain allow many events to flow through it, while a suspendable point resumes only once per invocation.". In fact, you can use channel if you need to model a flow of events. Moreover, there is a work in progress to bring all the usual cobinators (filter, maps, etc) to channels. See this PR for details/discussion: https://github.com/Kotlin/kotlinx.coroutines/pull/88