The project is supported by Prezi with the aim of making it production ready ( http://engineering.prezi.com/blog/2013/05/21/elm-at-prezi/ ) and all development effort is focused on that.

With the two most recent releases ( http://elm-lang.org/blog/announce/0.11.elm and http://elm-lang.org/blog/announce/0.12.elm ) it is really easy to drop an Elm component into an existing JS application, which we are experimenting with both at Prezi and in the general Elm community.

So I'd (biasedly) say to give it a try. Even if it's still too young for you, I think you'll come out of it writing way better JS :)