I have 2 DNS-323s, one with the DLink firmware which I have had for many years (bought it mid 2000s). The second one I bought a few years after the first one and that runs Alt-F . Both have had replacement hdds from time to time when a drive has failed but continue to work ok despite plastic parts of the enclosure now brittle and falling apart. Only downside is transfer speed is very slow. Although others have found SMB1 can be problematic (and poor security) I haven't had any issues using it on 2000, XP, W7, 8, 10 or 11 over the years. One thing I liked about the DNS was that if the hardware has a meltdown the drive can still be read and data recovered (with a Windows computer and EXT driver software). I have''nt tried to see if I can do that with the drives from the later Synology or Asustor units.
Some years ago I purchased a Synology NAS which was going to be a faster replacement for the DLinks. Very disappointing and the hardware failed just after the warranty expired.
Since then I have purchased 2 Asustor units, one installed at a friend's remote city location and we both backup to each local & remote unit to hopefully give some protection against fire, natural disasters etc.