I had the 8+ originally and I exchanged it for the X. My biggest concern was how well Face ID would work considering how easy and consistent Touch ID was. I can honestly say that I was pleasantly surprised at how easy and consistently Face ID works for me. I am used to the swiping motions at this point, though some could use some optimization. There are only two things I really find annoying at this point are apps that haven't been updated to take advantage of the entire screen and dealing with videos and the X's aspect ratio.
I am very happy with the X!