It has been reliable for me with Obsidian. I still prefer Obsidian Sync because it has good integrated version history and shared vaults.

Also agree with the sibling poster - I like subscribing to support them on a regular basis (and of course Catalyst).

Obsidian Sync is great (it helps that I got in on early-bird pricing...but it really is reliable).

In addition, the Git plugin, coupled with Working Copy on my iPhone and iPad, also work extremely well, with a bit of added overhead. Though iCloud works reasonably well for just about everything else, I haven't used it for syncing Obsidian data.

Yes I found it wasn't reliable. Perhaps it has improved, but Obsidian Sync has been excellent. I'm happy to support the developer as I'd like Obsidian to stick around.