Earlier quoted context omitted.
It's a fork of VS Code that still uses the official extensions, despite that violating the license terms. Functionally, it's pretty similar to using VS Code with Copilot, but with the added bonus of choosing from multiple models. I’ve only just started using it at work, so my experience is also pretty limited, but so far the results seem slightly better.
How is it violating license terms? As far I know, vscode is released under a permissive open source license. Isn't the situation similar to Brave et al built on top of Chromium but supports Chrome extensions?
There are open source alternatives, the basedpyright extension is better than Pylance and I've heard the clangd extension is good.