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
Well, "great interface" is debatable. It is decent, but far from being comparable to Sync. It feels like an Android app that hasn't received a UI update in quite a bunch of years.