Use Cases and Deployment Scope
Our organisation uses FreeNAS (now known as TrueNAS CORE) in a number of ways. We have an instance that operates as an office file server, an instance that provides network storage to our VMs, and another instance that we use for storing archived backups. In all three scenarios, FreeNAS works flawlessly, providing rock-solid storage using ZFS along with SMB, NFS, and iSCSI protocol support for all our networked devices. Also, it does all of this for free!
We've used this for many years, having previously put together our own file servers based on Linux and FreeBSD that worked well but required a lot of admin. The switch to FreeNAS was painless, ultra-reliable, and almost maintenance-free. No complaints here!
Other Software Used
Debian OS, Ubuntu Linux, Proxmox VE, Red Hat Ansible Automation Platform, macOS, Fedora Linux, CentOS Linux, CentOS Stream