I'm using the Mac version. Started with it today. It felt like getting all the benefits of RubyMine without the learning curve of needing to learn its non-Sublime macros, thanks to Visual Studio's option to automatically map key commands to mimic Vim, Sublime or Atom.

Not sure how difficult extending it is, but on day one in their app store I found all the important ruby bindings I needed to replicate what I value most in my Sublime set up: i.e. ruby linting and rubocop.

The switch was so painless I hardly noticed I wasn't using Sublime -- except in the moments of joy when I found the other powerful things it can do.

This stands in big contrast to RubyMine -- an IDE I absolutely also adore for its power -- but one that I found challenging to pick up due to its custom macros.