I bought an X (two, actually, one for me and one for my wife) just after the return period was extended on 11/15 and returned them both on Friday. While I wouldn't say (as one of the threads here is titled) that "FaceID is Crap," I think it has a lot of serious UX flaws. Can't unlock on a desk. OTOH, unlocks when it shouldn't. Requires more manipulation to unlock, with two hands, than TouchID does with one hand (unless you set Rise to Wake, which I don't because it's a battery killer and, with the X, would result in a huge number of unintended unlocks that would trigger yet another motion to lock the damned phone). ApplePay is a wreck. Overall, where TouchID works for me, FaceID made me work for the phone, which is unacceptable.
I'm sure that we've seen the last of TouchID, and I'm sure Apple will make great strides with FaceID, but 2018 is not the year for me to adopt it.