[dgeb]

Developers from several large public-facing sites have already told me that they're using engines in production. In fact, Kacey Coughlin is giving a talk tonight at the SF Ember meetup about LinkedIn's experience using engines [1]. Granted, the talk is titled "On the Bleeding Edge with Ember Engines", which fairly points out that there are some rough edges left to smooth over.

Still, I think it's a pretty good time to start exploring engines. I'd say that the feature should be quite stable by the time 2.8 stable ships. Plus, we should have a preliminary lazy-loading story finished by then, which has the potential to really impact your app's perceived performance.

[1] - http://www.meetup.com/Ember-SF/events/231368426/