Here’s a presentation by Kevin Carter from DEFCON 2015 about the Piratebox project, but almost everything he points out as a benefit is equally applicable to LibraryBox. I would argue that in a few ways, LibraryBox is even better…mainly in the ease of customization for your own uses. LibraryBox puts all of the files for the web interface on the USB drive, which makes customizing much more straightforward.
He definitely gets the variety of benefits this sort of device can bring, from routing around censorship to providing a secure place to communicate in politically charged areas. These issues are exactly what I’m going to be working on as a Fellow at the Berkman Center this upcoming year.