I have to say that learning and using Elixir has been more pleasant than any other language I have ever worked with. Code is easy to follow due to the functional nature of the language, and the community is one of the best out there.
The applications I've written and deployed have been more stable and fault-tolerant than anything else I've ever done, and I've yet to have any performance issues with the language in production.
Jose Valim and team did an outstanding job being welcoming to new members, emphasizing documentation, friendliness and ease of learning and paying attention to usability. That is no easy feat and requires a lot of hard work and determination, very impressed by it.
Snide aside, it's not this mystical technical panacea. As for community... it has had a large upswell of Rails developers... for better and for worse.
That said, I've had a wonderful experience with all the places I've used Elixir in production or soon to be in production.
My own personal experience doesn't matter much, though, because ultimately Elixir is Erlang and obviously Erlang has been pushed extremely hard in production (Klarna, Heroku, Riot Games, etc.).