@goatsarah I got a DS1019+ (in 2019) to replace my Drobo 5N. It's Just Worked since, but I'm not doing anything very complicated with it.
Looks like the closest current model is the DS1522+ (although that's 2022 hardware).
I like that the storage is just a pile of Linux and can be recovered on any PC.
I tried using it as a general Linux server, it's doable but the OS is a bit too opinionated to make that pleasant. Now it's just NFS mounted to a separate Debian box, as well as CIFS shares.