The first one I bought is still in service at my parents' place, silently and reliably backing up their cloud files and laptops.
I was fully expecting to buy more in the future, but this is a dealbreaker. If a disk goes bad, I want to go to the local store, pick one up, and have the problem fixed half an hour later. I do not want to figure out where I can get approved disks, what sizes are available, how long it will take to ship them, etc.
I've recently installed Unraid on an old PC, and the experience has been surprisingly good. It's not as nice as a Synology, but it's not difficult, either. It's just a bit more work. I've also heard that HexOS plans to support heterogeneous disks, and I plan to check it out once that is available.
So that's the direction I'll be going in instead.