I have tried to use Atom many times. It is built in open - source spirit and has a very friendly community. So I download every release which is even slightly talked about and try it (including 1.0) , and every time I end up wishing it was faster like Sublime and switch back. I code in Python/Go, both of which have very exhaustive plugins in Atom, but it turns out autocompletes are noticably slow. I do not mind if I type a few characters and they appear a bit later on screen, but like 5 seconds after pressing enter <I use enter for autocomplete> is kind of unfair, esp when you see things happening almost spontaneously in Sublime.

However, I would like to say that it is getting better (version 1.0 is way better than the first one I tried) and has the potential to become the next emacs. But its not right now there. I will not wait till then to switch, but unless Atom gets faster, I am not taking a plunge. I think Sublime is the undisputed leader for me till this happens.