I love it! Dave Thomas' Programming Elixir 1.3 is the book to get if you're just starting out.
As Elixir is built upon Erlang, I found "Programming Erlang, second edition" by Joe Armstrong to be a gentler introduction.
After 20+ years of OO (and my mental models built upon C and assembly), functional programming and Erlang's model built upon immutable variables, pattern matching broke my brain for a few days. I just didn't get it.
However, I didn't stop. I am now bouncing between both books and it's beginning to sink in.