After 3 weeks of daily testing the RE450 isn't great.
Unidentified network issues, connection dropping, firmware rollbacks (in attempt to see if the damn thing will work).
I think I have pretty much exhausted the use of this product until a new firmware upgrade comes out from TP-Link (beyond the January RE450 V.3 one).
Having searched numerous threads on this community site its clear the RE450 has some serious issues right now. Both the wireless and Ethernet functions seem to fail.
Fingers crossed they come out with support!