Do you use them?
I keep seeing them recommended by random YouTubers in "guitar hack" or "gift ideas for a guitarist" type of videos (I know I am very productive when I work from home). I just don't get why you'd need one. I am perfectly capable of turning a tuning peg with my fingers and I don't change my strings enough that saving 10 seconds every time I do is really going to change my life.
Am I missing out?