Sure, this one had a free version and it was great. Except after a few weeks Obsidian started behaving weirdly, and was 100% reproducible by enabling or disabling the plugin in question. And then I noticed that some of the markdown files were modified (sections deleted) - but I hadn't noticed immediately, so they'd had edits after they were modified - hence the tedious manual merge.

So it may be "just this one plugin", but Obsidian is so important that I'm just not willing to risk it.