I've found VSCode Vim bindings _really_ buggy. Sometimes non-responsive to the escape key until I press it a few times, sometimes it will kill highlighting of code blocks until I switch modes, sometimes enters `<tab>` in the source code instead of tab when I press the tab button. I still use it, because I've used modal editors for so long and I like everything else about VSCode, but the vim bindings are my biggest point of frustration with it.

Sublime's vintage mode is, in my experience, light years better, if not in completeness, at least in stability.