I am using it and I am considering disabling it on a daily basis. Not only is it slow as mentioned elsewhere, it interacts poorly with other VSCode features, like automatic bracket matching, intellisense etc. I find that when recording macros, I have to be very careful to consider what the vim part might think just happened and try and work around it.
But every time I disable it, I immediately miss normal mode. So yeah, as happy as I am with VSCode (which is a lot), the situation is suboptimal.
I found vscode macros particularly painful. Slow & where vim optimizes things. Typing abc^H^Hsdf will seamlessly play out as asdf, but with vscodevim I have to watch the macro repeat my mistake each time
I have used this extension a bit and it works great as far as I can tell. Whereas with the older popular VS Code vim extension, I would get broken behaviour within minutes of use. And I am not a particularly proficient vim user, this would have just been navigating, using visual mode a bit, correcting some stuff.
But every time I disable it, I immediately miss normal mode. So yeah, as happy as I am with VSCode (which is a lot), the situation is suboptimal.