Once you get it running despite their poor support for Android CPUs in their native libraries, half the examples and half the dependencies on the web out there crash immediately because they decided you have to import React and Component from "react" instead of "react-native" now. And there's no stack trace at all when it crashes for that error since it crashes before the normal source map functionality that provides them. My company has hundreds of files being used by React Native on iOS, but they are unusable due to this, even hours of search and replace cannot fix it because it is still crashing out, probably due to one of a dozen dependencies. Similarly if you try to use react redux 4 you are screwed, only 3 is supported. Woe be to anyone who upgrades that dependency.
As a Java programmer who is used to compile time errors when something is wrong, React Native where it crashes constantly at runtime due to poor platform decisions like forcing developers to use a different package from earlier versions is a tough pill to swallow.