I’ve actually purchased one second-hand recently, and in the process of setting it up with some infrastructure! So far managed to set up ProxMox with Home Assistant OS running in aVM, and it works wonders. :)
I’m looking at modifying its specs a bit - currently the only place I can set it up in is a living room, and the PSU fan proves bit too loud, so I’ll be replacing it with a Noctua one; and for other noise-reducing means, SSD as the main operation drive, spin-down on idle set up for the regular HDDs, and a set of padded rubber “legs” to stand on to reduce vibrations. :)
In case anyone looks to put SSDs in their Reliant box, this 2.5" to 3.5" bracket aligns the SATA power and data into the same spots as on 3.5" drives, allowing you to put those smaller SSDs into Reliant’s drive brackets. :)