Just set up a new EX2 Ultra (diskless) with 2 4TB 7200rpm Seagate drives in RAID 1.
Upload speeds are 355kb/s and download speeds are 1-2MB/s.
It’s connected to an Archer C7 router via 1Gb/s connection. Computer is a Microsoft Surface Pro 4 on 5GHz wireless about 5 feet from the router. Speedtest on the internet is just fine.
Got this as a backup for my photos (I generate 10-20GB per week) and the current speed makes this a total bust.