Probably gonna return my X for an 8 Plus. Had 7 Plus previously. There are too many downsides compared to a Plus for me. Video is very small. Websites are too narrow. Control Center is hard to reach. Reachability is too hard to activate. Keyboard feels cramped. PDFs are harder to read.
Face ID is not a clear improvement over touch ID for me. It only works if your face is pretty much right in front of the phone and unobstructed. I’ve noticed it does not unlock while sitting in my car mount unless I lean way over to get in front of it. When lying a table, it can't see me sometimes. When I look over at it on my nightstand while part of my face is obscured by my pillow, it fails. Touch ID works the first time in all of these situations. Furthermore, Face ID is a pain when it does fail. It automatically throws up a number pad to enter your passcode, and this has to be manually cancelled before you can try to use Face ID again. It's not always bad. Face ID works great a lot of the time when the phone is right in front of you, but I've learned there are apparently a lot of common situations where I am used to Touch ID working perfectly where Face ID repeatedly fails.
Main thing I do like about the X and will miss is the home gesture. The X screen also does look nice, but I feel a lot of that is due to True Tone, and that is on the 8 Plus.