It makes most sense when you're chasing terabytes per pound and the NAS sits somewhere noise doesn't matter. Think garage, or a rack in the cupboard under the stairs. You also get five years' warranty, two more than the cheapest NAS lines. CMR, thankfully. SMR and parity rebuilds don't get on.
!Watch out for
It's a 7,200 rpm drive and you'll hear it working.
No Backblaze failure rate for this one. They don't run enough of them, if any, for a figure worth quoting. WD's datasheet puts it at 29 dB idle and 36 dB seeking. Power draw is 5.9 W idle and 7 W working on WD's figures, or 52 kWh a year if it spends the whole year idling. Put four in RAID 5 and you'll have 12 TB to fill (Windows will call it 10.9 TB).
Specifications
Each value links to the Western Digital page or datasheet it came from.