Just installed 6 of these drives into a TrueNAS server in RAID-5, and so far performance is excellent. Drives are very quiet, fast and responsive, connected via a Dell H310 card. I installed 4x 4TB WD Reds in this same server circa 2015 and they are still going strong, and I have equally high hopes for these. Installation couldn't have been easier, as soon as I had the correct SATA cable (need forward-breakout when going from RAID card direct to drives) all of the drives mounted perfectly. Literally was just plug-and-play, refreshing when stuff just works. Thanks WD.
Got 2 of these on sale for my NAS (My Cloud Ex2 Ultra) to upgrade capacity for my RAW photo backups. Resizing RAID-1 went off without a hitch. It took a long time, like a day but all I had to do is swap drives one by one and come back hours later. Make sure to follow instructions in the web UI, for example initiate resize from UI before hotswapping the first drive. Neither the old 4TB drives nor the new ones ever gave me problem, the NAS box just sits in a closet and I periodically move photo folders from my laptop to NAS to free up space for new photos. Overall a cost effective setup that just works.