Still using my Helios64. It's working as a basic NAS just using NFS over the !G ethernet, although I did also make it a secondary DHCP and DNS server for my home network. Still running Buster, but downloaded the latest Trixie release today with a view to figuring out how to get it installed.
Also noticed that the disks have almost 51000 hours of power-on time recorded, so it's been running most of the time since I first set it up in late 2020. It gets time off for long power outages and mostly just sits there quietly doing its job. Uptime is currently 619 days, although that will reset to zero if I tackle the OS upgrade.