Currently working on a project using gatsby, have had some big wins but other things have been a pain. The single biggest feature you get is SSR rendering for an application built in react. There are lots of little goodies like Gatsby Image and Gatsby Link that are actually really awesome.

I personally am not that huge of a fan of the graphQl layer, we have been using it with basic use cases and still have run into issues with it.

Definitely not a revolutionary framework or tech, but for its use cases it does work.