My experience has been pretty good. In terms of functionality they both effectively do the same thing, but the one thing that makes Resilio Sync slightly nicer than syncthing is that I can just give out key for directory that I want to share - similar to a torrent magnet hash. Whereas with syncthing I have to connect and allow multiple devices together in order to sync between them - with Resilio Sync I just give out key and device can start downloading/seeding content. That may not be a big deal if you have a few personal devices, but if you're distributing files with a number of devices you don't know (as you typically do when torrenting) then you can just leave key out for anyone who wants the content.

As an added bonus, compared to a traditional bit torrent client, Resilio Sync allows you to update the content in a given directory and the users in the swarm will also get the new content without any additional work.

So far myself and a small private community are using it to archive about 2.5Tib worth of data that continues to get regularly updated - never once had an issue.

Syncthing-Fork (F-Droid)

I have, I bought it all the way back when it still was bittorent sync. I've had some quite terrible glitches that required completely resetting it a couple times but I think they've figured things out now.

Also, just run the old docker, it's compatible. Note you may want to double check if it's secure tho

@Moonrise2473@feddit.it Fwiw, LinuxServer still maintains a resilio-sync docker image for 3.0.0. They are fairly trustworthy.
https://hub.docker.com/r/linuxserver/resilio-sync

@linuxserver@mastodon.linuxserver.io

I only used it to download certain Star Wars versions, because these nice gentlemen couldn't be bothered to use real torrents.

No idea how you would use that as a Syncthing replacement though.