I am a user of openmediavault which I successfully installed on a Terramaster NAS and have been using for the last year or so.
Alongside omv I have been installing several other packages, namely gitea for dealing with source code, mysql server and a wackowiki for storing documents, directus for dealing with collections, syncthing for synchronizing folders across devices and several other things which make my NAS a good information radiator for my current uses.
I realize however that I am using 1% of omv software which for me is basically a linux distro which shares at startup a series of folder via SAMBA.
Maybe it has some RAID and disk utilities I am not currently using but nothing more for me.
What omv seriously lacks in my opinion (and incredibly all open source competitors such as TrueNas, FreeNas etc) are the functionalities for quickly browsing its storage while on the go: that is a web interface to access documents, photos and quickly search/browse them.
There are so many open source PHP file browsers out there that I am surprised none of these made into any of the NAS open source solutions out there.
At present I have a nice network storage server which I can browse via my Linux desktop but as soon as I am somewhere else with a smartphone or with a work laptop I have no way to access these files via web browser.
My rant has finished, good sunday everyone.