You can work on a Doc, Sheet or Slides on Drive. Log out and login elsewhere and all your changes are there too. The application only receives edits and pushes screen changes back via HTML 5. Very light on network usage compared to sending Office files up and down to the cloud.
The constant breakage feature of Microsoft Windows is missing.
Taylor made (avoid the constant breakage feature to begin with)
Roll your own (if you want to fix the constant breakage feature yourself)