I'm thinking I might upgrade from my Synology NAS. It has 5 WD Red 3 TB disks in it. It's pretty similar to this (the 1512 only has two LAN ports and I think it only supports USB 2.0).
https://www.synology.com/en-us/products/DS1515+
Really nice features, built-in cloud FS and remote FS sync, media servers, tor-rent box, etc etc.
https://www.synology.com/en-us/dsm/app_packages/all_app
Anyone interested? The units still go for 800-900 without drives on Amazon. It's set up in RAID 6 so you could just use it as-is for probably another 3-4 years and then just upgrade the disks if one fails.