Can I start my React app development with create-react-app or is it only meant for creating React prototypes?

I want to create a React app; that I would later like to take ahead to make a "production-level" app, and I am unsure about create-react-app.

Should I use it, or shouldn't I? npm eject scares me. Can anyone explain what npm eject does exactly, and whether if I would have any problems with not being able to add custom stuff to my build?