I've been using it for years and I really like it.
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It's really nice, I have a setup to sync a lot of stuff to my server from my phone and there I can easily do backups.
Great project, and I use it to sync files between machines, VMs, and a file server. So you can make an easy to manage and use cloud based solution. Throw in Zim with Markor for Android, and you can piggyback a notes solution too.
Another recommendation from me. I mainly use it to sync my music library between my desktop, my NAS, and occasionally other devices.
Calling Syncthing perfect is an understatement.
If you have a network, the merge conflicts are a real issue, though. Windows wrapper synctrayzor helps to deal with them somewhat.