I agree. I've been using react with reflux, reflux is an excellent implementation of the flux model. It makes it simple to wire global modals into actions which can trigger those from anywhere in the app.
Also more on topic, I really like the material-ui project, and it's modals are quite nice.
Reflux is good, but I'm worried about how much they depart from the Flux architecture. What will happen if in the near future Facebook will release their own library? A lot of refactoring...
Also more on topic, I really like the material-ui project, and it's modals are quite nice.