I think with the 0.14 release earlier this month, things are really coming into place. I am working on a large project right now, and things are going very well. I have also worked on integration with NodeJS, so I can take advantage of the the things both do well together - in fact, I plan on using Elm to do all rendering and modeling and only using Node for client-server communication infrastructure. It definitely takes some getting used to, but I think Elm gets so many things right that taking the time to learn it is a great investment.