I Bought the 3Tb and had the 2Tb bought as a present from my son who didn’t know I had bought one.
Worst purchase I ever made, internally (just on WiFi) they are usable but frustrating due to speed, externally on the odd occaision you can contact either of them the speed is attrocious, other issue
Uncontactable most of the time
They back up (17 hours the 3Tb with about 2tb used) but the “Update” facility so that you don’t have to do a full backup each time has never worked in the 3-4 months I have had them.
Sometimes won’t come back online after a reboot (takes about 10 minutes to reboot)
I have a fiber optic connection so broadband speed shouldnt be an issue
They are ok (just) as a hard wired hard drive with lots of space
The “Help/support” link in the UK software logs a ticket with the US so they couldn’t understand why when they rang middle of the night (and to be fair they did) I didn’t answer, after about 2 weeks it clicked and they very politley closed the ticket