Good news! I'm going to switch from Emacs some of the time, and hopefully 100% eventually. The thing that bugged me was how uneven the way editor would react in some cases. For me it didn't have the reliability I need. I was interested in the fundamentals and found underneath is code-mirror. I thought eventually all code-editing should move into a browser, but isn't quite there yet. Hopefully this will move to 1.0 and be a full emacs replacement.