Large Organizations and Huge Companies Drawing on OpenAFS

Due to scalability, OpenAFS lends itself to be used by large organizations or corporations.

One example of large organization (school/university? Hospital? USGS?)

One example of large corporation using OpenAFS?

One example for Fortune 500? (Morgan Stanley) They are betting their business and the stability of the world's stock market on the reliability of OpenAFS?

What issues does it resolve/prevent? How does OpenAFS "shine"? What perceived or real challenges might lurk in the shadows? What can be done about them?