I have several blind people among my closest friends, and none use a braille reader. Braille readers are awkward - not only takes it extra space on your desk, it also requires you to move your hands from the keyboard to the reader - you can't read and write at the same time. They are also expensive - if you have multiple computers, you'd need multiple braille readers. And then there's the encumberance factor - can you imagine using a braille reader in combination with a laptop?

It's much easier to carry a CD with a screen reader with you.