Been waiting for the 6 or 8TBs to go down but good price for the 4TBs. Of course Black Friday nears so you may want to wait and see.

Amazon product: Seagate IronWolf 4TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 5900 RPM 64MB Cache for RAID Network Attached Storage – Frustration Free Packaging (ST4000VNZ08/VN008)
Customer Reviews:
Need a drive you plan to leave running all the time? This… will probably do the job. | Read and write speeds aren’t great, but for the capacity and the usage it’ll do. | Currently using it for a NAS / PLEX storage drive. Been working fine for the past month, nonstop. | Basically, if it’s what you need then I see no reason to not get one. | Appears to be pretty identical to WD’s Red line, can’t tell the difference between the two myself (as I have both in 4TB capacities).