Yup I have used lots (probably 16 or so) of the WD "Red" drives in NAS applications and not had any failures as yet after several years
So they are certainly a "safe" choice. Performance is ok - you need gig ethernet to keep up with them.
I have used the 1TB version (Seagate 3.5, 1TB, SATA3 SSHD Hybrid Desktop Hard Drive, 7200RPM, 64MB Cache, model ST1000DX001).
Again it seems like a nice drive - I have not used enough of them for long enough to comment on reliability.
(note the one I have used is probably not certified for NAS/Server style
24/7 operation in a box with other drives)Performance is impressive in a desktop environment - no far off the speed of pure SSD but without the cost of the hassle of needing to deal with different partitions for different purposes (not a problem for me, but for some users, coping with more than one partition is a non starter!)