No I haven't. I'm not on a constant chase to find the better tech. I wanna write good code and come back in the end of the day to eat dinner with my wife. Even if Elixir is objectively better for web development than Rails (which I highly doubt), I wouldn't necessarily want to invest the effort in learning it. What's so interesting in learning 10 different ways of writing yet another CRUD app? Some people get a kick out of it. These people don't have kids lol.