I've seen it and have used it several times. I listen to Medium articles on my phone, with my headphone as I'm going about my chores around the house. I don't really have a preference as far as the AI voice goes, except that I like the female voice for articles written by women and the male voice for ones written by men. As far as pros and cons, the pros are convenience and the ability to listen to stories when you can't take the time to sit down and read them. The only con I can think of off the top of my head is that I find the AI voice reads a little slowly for my taste.