I did a poll and nearly 30% of the people who voted said they used Sync! It's stayed around that percent the whole time too!
EDIT: Here is the poll I forgot to put this here like five times lol https://strawpoll.com/wby5A21R1yA
It may have been rock-solid in the last few months since, but back when they were having their version numbering issues, I was a very new lemmy user and didn't understand what the problem was (not that I should have had to)- the only thing I knew at the time was that other clients that I'd just learned about somehow didn't have the same finicky version number problems as jerboa. It kind of wrecked my entire new-lemmy-user experience - especially since (as far as I know) Jerboa is kind of the semi-official client for Lemmy - it doesn't need to have all the bells and whistles baked into more robust 3rd party clients - it just needs to be rock solid and run reliably as its only job, and it failed.