Ask HN: Is React Native ready for building high quality mobile apps?

The showcase apps for React Native doesn't have very many rich & complex mobile apps (except for Facebook's own apps, but we don't really know how much of those apps are actually React Native based). NativeScript showcase page is even worse. So, I thought of asking HNers what their experience with RN (or NativeScript) has been. If you were starting a new mobile app startup, would you bet on React Native or NativeScript? If not, what are the main reasons against it?