Great app, it didn’t really fit in my workflow last time I checked but it’s definitely one of the best desktop markdown editors out there. Might revisit it soon.
I gave Zettlr a shot in May, but ultimately decided to use Obsidian instead. I don’t need the Zotero integration and citation features.
Some issues I ran into at the time:
No automatic link updating when notes are moved (I use a folder structure)
No backlink suggestions
Editor jumps around while doing things like checking boxes
Zettlekasten filenames (not sure if you can change this)
The first and last issues are fine if you use a Zettlekasten setup, though I think you’d want backlink suggestions even more than you would with a folder structure.