Good performance
Bought 4 copies for a raid 5 on a Synology.
No problem migrating old disks (WD Red 2012 3TB).
The system is really responsive (it's a big machine though). During backups on a 10 Gb network, backups run at 8 Gb, so 800 MB/s. We'll have to see over time.
The WDs have lasted 12 years overall (with a few clashes).
The Toshiba disks used on a server in the past gave total satisfaction (performance, reliability), so I hope that this will be the case with these NAS disks at 7200 rpm (average temperature 28°C).
Satisfied!