I'm beginning to overflow the amount of disk space I have available on my local drive, and have been considering DAS solutions for storing data that I'd like to hold onto, but never access from more than one place at a time. I already pay for Backblaze, so I'm considering a JBOD or DrivePool setup.
However, it is not at all clear to me how to tell a quality DAS solution from a bad one. The unit that I keep gravitating towards is the TerraMaster D4-320, mainly on the strength of recommendations of this subreddit and this video which describes the differences between a SATA splitter and using a USB hub, but this sort of information is surprisingly difficult to source on other devices. There are other units from lots of other brands - QNAP, Yottamaster, Cenmate, Syba, Mediasonic, ORICO, SABRENT - some cheaper, some more expensive, but the reviews are all over the place.
So....which way is up? What are my actual options for four-bay 3.5 drive enclosures, and how can I tell a good one from a bad one?