I use it myself and I'm content with its features and performance. (It fits my workflow. It is quite stable. Tags and backlinks are awesome and scripting yields good results for dynamic tables.) But:

The wysiwyg editor has its quirks and missing features. I. E. In certain cases it scrolls down multiple pages when I just want to move the cursor a few lines.

The full text search doesn't return all results (at least with default settings). Sometimes I need to use grep on the md files.

It is quite slow on startup both on android and PC. Maybe because electron.