did this yesterday. Returned my iPhone X at the Apple Store and bought a iPhone 8 (64Gb storage) at a reseller for about €475 less then a iPhone X (64Gb storage).
FaceID, for me personally, is way less convienent the TouchID. TouchID is still King for unlocking the device .
I had my iPhone X for over 4 weeks, did the FaceID set up 3 times.
Also, the screen of the iPhone 8 is perfectly fine, or let's say it this way: the display of the X is not worth the extra € 475 over the iPhone 8.
You can get some really good deals already for the iPhone 8 (Plus) at several resellers.