I'm writing from not only first hand use and experience but from students that tried it. Some seem OK with it and that's fine but they are still lagging behind the pen and paper folk as to speed.
As to your interview scenario I have a very nice recorder for such work. Do you? We have a few at our disposal at the office but my favorite is a Sanyo ICR-XPS01M.
Sorry if I sound cynical but I'm writing from experience. I find many folk have not used such things so I share experiences from both students and my own use.