We have it in production at CitizenNet, where we’re in the process of migrating an existing Angular 1 app to Halogen. Most of the application is still in Angular, but we’re making good progress at incrementally moving over, and the whole team is committed to getting to 100% PureScript as soon as possible. We all can’t wait until we never have to look at Angular code again!
Our main application is private, but you can check out our UI library purescript-ocelot, as well as purescript-halogen-select which several of our components are built upon.