We've been rebuilding http://customer.io in Ember.js over the past week or so. After dabbling in ember on a few screens, we decided to take the plunge and go all the way. We're feeding data to ember from a private API on the back end. As the front-end guy in our duo, I love being able to bind UI to ember objects. It's really refreshing to be able to bind a text field and an h1 to the same ember object and watch the latter update in real time. And everything being in javascript makes it great to debug using the console in chrome. As ember matures and becomes more widely accessible, I'm excited to see even more great stuff being built on Ember.