Looks nice, and possibly something to help streamline mobile development (though getting into some of the examples it was not as simple as I initially suspected).
I played around with their Hello World sample when it first came out. My only hesitation with using it is its reliance on Dart. I still lean towards React Native for giving me a balance between performance and developer convenience 
That’s what threw me too. I mean, I hear some people really like Dart, but it’s also one of those things that keeps Flutter from being as accessible as it could be.