I have been working in React full time for probably two and a half years now. I work for https://staxapp.io which is large application mostly built on React for the Front end. During this time I have enjoyed working with React very much, it is a great library for building front end applications.
At some point in 2015 I heard about Elm and I was intrigued. I have been dabbling in Elm for over a year, mostly building libraries and making little side projects.