UI Frameworks with React.js [on hold]

I am working on a project where we are developing a web application which has the primary function to allow users to search a database for some records. At this stage this is the only functionality of the web application. However in future iterations we plan to allow users to do a little more.

We have decided to go ahead with React.js to add the javascript functionality. We am now at the stage where we must decide on a flexible and CSS library which integrates well with React.

I wanted to get some input as to what people think of the following libraries:

  • React-Bootstrap
  • Semantic-UI-React
  • Grommet

We have decided not to go with anything that's material, and not with Kendo UI due to previous bad experiences (with Kendo).

I am also having a hard time finding places where these frameworks are used (especially for Bootstrap and Grommet). Can people refer me to some examples?

Any questions please ask, and thanks for your inputs.