While I use ext4 on my home Linux machine, so not hit there. However on my office Windows machine my Dropbox folder resides on a Veracrypt (née Truecrypt) partition, which Dropbox has started complaining about.
So far SyncThing is looking pretty good in general. Two things I would really like to see:
* Support for non-trusted servers[1]
* Android app that is able to view and pull files down as desired (and possibly with the option to flag individual files to always be cached locally). You usually don't want your phone to hold local copies of everything in the shared folder(s) as it is usually space constrained.