Can vouch- been using this tool the last couple months and it's been magic. It's new so there is definitely a learning curve, but once you get things working it solves the cross-platform problem completely.
Does it really? The layouts on Android seem very iOS-y unless you apply "platform customisation" but that seems to defeat the purpose of this framework. I think it's a nice toy experiment to cross-compile things but not really transformative enough to be a viable option. Also becoming dependant on a for-profit company to build your app on top of the platform, I think there are others who have tried this as well.
Nothing non-standard about it, and you can certainly convert existing code. But if you want to convert an app - as opposed to a framework - you should start with our template and move your code over. The Xcode app project file format is opaque, making it very hard to migrate, and we rely on it being set up in a certain way to be able to build for Android