Same here, I switched from Rails to Phoenix a few years ago and have never looked back. It solves so many of the frustrations I had with Rails and I love the Elixir language and the community around both.

There was a little bit of a learning curve; Elixir's syntax looks like Ruby but the underlying philosophy of the languages is really quite different so it does take some getting used to, especially if you haven't worked with a functional language before. But it wasn't that bad; it's much more accessible than the other functional language I've dabbled in (Haskell).

If I was starting a business the main thing that would put me off choosing Elixir would be the relatively small number of people who know it. If you want to have a lot of Elixir programmers in your company then you'll probably need to be willing to hire people people who don't know it yet but want to learn. But I hope this will change as Elixir keeps growing in popularity.