I'm curious too. Anecdotally, I've never seen anyone use it for anything (I work in an office where Macbooks are standard issue). I think when I first got it I dicked around with it for 5 minutes, changing the colour of my terminal using the hue slider, and it was cool, but I haven't used it since. It just feels like a sales gimmick that serves no real purpose except to look fancy in an ad.