ya its great, it can be scary as one might not be too used to have mirrored folders with no fallback so jist be careful if you are a new user...start simple and dont go crazy or youll end up deleting shit in every place you have it by accident if you dont know what you are doing.

Syncthing is great. We have 4 devices syncing. Two-way/multi sync can be a challenge, but once configured, it works great.

We often create manual backups outside of the main sync folder, just in case.

By the way, I heard that they are discontinuing the support for the android app:

https://forum.syncthing.net/t/discontinuing-syncthing-android/23002