In use, it is very different from Sublime Text. Especially the plugin system is far more powerful.

I still prefer Sublime though, Atom is still too immature, and some packages I need don't exist yet or are far too unstable.

That, and Atom is just far, faaaar too slow at the moment.

care to list a package that you need to that isnt in atom yet? (i would love to take a crack at building it)

Most importantly I miss SFTP. There's already a github project for sftp, but at the moment it's almost unusable. https://github.com/jules-r/atom-sftp

I also really miss bracket highlighter, it's a super small tool, but very useful. You could tackle the bracket highlighter plugin, it might even be possible with pure less/css depending on if Atom already has this built-in.

And I miss being able to run a Python REPL in Atom. Python and JS are my main programming languages.

I said something similar on seeing Sublime after using TextMate for 5 years.

I will switch when Atom gets more stable (I still encounter bugs everywhere), and more performant.

I have already developed a plugin for Atom, I hate the living shit out of Coffeescript, but I like Atom's API. It's a shame that the spacepen API was built in such a way that it's unbearable to write plugins with it in pure js.