I used one in undergrad. It was a digital recorder that plugged into my USB port. My professors didn't have handouts. They just talked and I wrote down what they said. The recorder allowed me to write my notes legibly later on.
I'm a little dyslexic when I try to write quickly. I mix up the letters p, b, d, etc. Sometimes I write the entire word backwards. At UF, I can pause the lecture and catch up my notes. So, the digital recorder is now on a shelf.