I played with Elixir and Phoenix for about two years. I absolutely loved it. To be honest, Elixir wasn't my favorite, but I felt like Phoenix was everything Ruby on Rails ever set out to be.

I did find the documentation a little sparse at times, especially when dealing with heavily nested tables (or even just many_to_many relationships were cumbersome to work with).

Things like Plug, hex, pattern matching and so much more have stuck with me and I still miss them almost daily in my current stack.