One of the organizers of the Northeast Linux Fest (March 16 & 17 2013 Harvard University) is blind and the advantages of FLOSS to a blind person convinced him to switch.
“Once I started using a free screen reader with a free operating system, I had freedom in my own computing, and realized the importance of free software for accessibility — it is important for people who depend on accessible software to understand the freedoms that come with using free software, and no longer be stuck in a world of relying on nonfree accessibility software.
So I’m now an advocate of promoting the use of free software in accessibility and want to help educate other people who depend on assistive technology and explain to them the freedoms they deserve.”
I have used some of this in a classroom with a nearly blind student. It changed his life. He loved computers and had been frustrated by the difficulty of using them. His attendance and attitude in school improved greatly.