To the programmers who worked with Erlang and related languages (so targeting the Erlang VM): how was your experience?

I'm interested in the Erlang ecosystem but would like to know if its languages are hard or can be considered powerful modern languages (and possible easy, but not "Python easy", I want to write efficient software with statically typed syntax).
Also, how mature is the ecosystem? Are there good frameworks to write scalable webservices with? Did you have fun using them and the language or was it more a headache-inducing experience?

So all in all what did you experience, in which context did you; and would you recommend learning an Erlang related language?