I have to say, my experience of Devise with Omniauth in Rails 4 has been so painful, I abandoned using Rails for the project entirely. It's interesting that for the de-facto "convention over configuration" framework, the article likes that Devise "gives you a nice way to configure everything". So does Spring, but that's not what I want when I'm aiming for maximum productivity.

If you compare setting up a new project in Rails 4 that lets users authenticate with Github, with doing it in Meteor, you'll see what I mean.