I've tried it on and off. It appears to have more potential than obsidian in some ways, but obsidian's plain text files are hard to beat^1^. If you're willing to put in more effort into your notetaking, especially if you're a programmer, it may be worth it. It has nowhere near the plugin ecosystem at the moment obviously, not being as popular.
Compared to logseq, which I haven't tried super extensively, resource usage and performance are much better, on par with obsidian.
Also a lot of the interface and plugins are in chinese, so if you don't read that it can be a bit of a pain.
[1] siyuan is markdown too but but it's stored in a database, not your filesystem.