They have a great list of supported editors:
- Android Studio - Chrome (Colab, Jupyter, Databricks and Deepnote, JSFiddle, Codepen, Codeshare, and StackBlitz) - CLion - Databricks - Deepnote - Eclipse - Emacs - GoLand - Google Colab - IntelliJ - JetBrains - Jupyter Notebook - Neovim - PhpStorm - PyCharm - Sublime Text - Vim - Visual Studio - Visual Studio Code - WebStorm - Xcode
I have found that the completions are decent enough. I do find that sometimes the completion suggestions are too aggressive and try to complete more than I want so I end up leaving it off until I feel like I could use it.