I've been using this for months and it works well.

The reason I'm using it over the default file manager of my phone or others is that it's open source. It's a matter of trust.

I install from F-Droid because if an app is both there and on Google Play it's pointless to give Google an easy way to know what I'm using.

F-Droid got much better lately. Strange things don't happen anymore on updates.