Got my X a few days ago, moving up from a 6S and my god it's a great update. Got used to the gestures immediately, and Face ID is awesome. Kinda wish it was a little faster but I can live with it. Seems to work better with my old Samsung wireless charging pad than my S6 and Note 5 did when I had them.
One thing though, the service is pretty bad. Where I work the service already isn't great, but I was always pulling 1-2 bars on my 6S, my X just flat out gets nothing. Noticing at least 1 bar less than normal in my other usual spots. I figured it might've been the case I had on it, which was a cheap on my girlfriend brought me home the day I got it, and since I picked up a new one and reset the network settings for good measure and it has been better. Able to get 1 bar almost consistently at work. It's not that big a deal as I mostly iMessage anyways and I can do that on the Wifi.
I do have the model with the supposedly worse modem, but I'm fairly certain that's all I can get in Canada. ¯\_(ツ)_/¯