Experiences with Kotlin/JS?

I'm a long-time GWT user, but I've recently been tempted by the siren songs of Kotlin/JS. Does anyone have any experience with it? Is it worth migrating to?

How large is its JS output compared to GWT? Is the code output reliable and mature? How is the debugging? How is the JS interop? I've read that there might be semi-automated methods of converting Java code to Kotlin--how have people found that? I don't use many of the GWT libraries, so I can easily rework that aspect of the code. Can I stay with Eclipse-Maven or will I have to move to IntelliJ-Gradle? 

Every time I look at J2CL, it just seems like it went too deep down the Google rabbit-hole and is completely divorced from modern JavaScript practices, so I've been curious about other possible future migration paths for my GWT code.

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