"EIT",

Stick with Robocopy. I come from the other way around, having learned of
Robocopy only after spending way too much time playing with SyncToy trying
to get it to do the simple task of mirroring folders between a PC and
another one as a backup.

Pretty UIs can die as far as I'm concerned, if the core app is busted.

(ask me how I really feel) ;-)