Let's get this out of the way... DO NOT buy the iPhone X. That is, if all you want is a new smartphone. Because, as lots of other people pointed out, there are better choices out there that simply cost a lot less.
Lewis from UnboxTherapy said it all:
I spent some time with the iPhone X recently and I admit that the display is very impressive. That is, until you see the notch. I don't care how much people say and Apple claims it's a design feature, it's aesthetically unpleasing. But even that could be up for debate. What is not up for debate is that the notch hinders user experience. Plain and simple, it's bad design and unnaceptable to me.
I feel that even though Samsung's solutions to achieve a good body-to-screen ratio on the Galaxy S8 an Note 8 aren't as impressive, they work out better in the end.
The new gestures to navigate the UI on the iPhone X are... fine. They work and you kinda get used to them quickly. But they're still not as fast or intuitive. Having to swipe up on the screen every time you need to unlock your phone is just a little tedious. But hey, if you hit the power button on most Android phones that are not passcode-protected, it's the same gesture.
And iOS 11 is quirky and buggy as usual. It seems to me that Apple completely lost its way when designing the UI here. There are diverging patterns and similar actions produce different results. My main gripe is the Notifications shade. It was bad on iOS 10 and they managed to make it worse on iOS 11. You can't tell if it's the lock screen or the Notifications shade you're seeing, most of the time.
But even though you can buy a Samsung Galaxy S8 or a Google Pixel 2, similarly-sized phones (that have arguably better cameras) for a few hundred bucks less, or two of the excellent mid-range OnePlus 5T for the price of an iPhone X, it's still going to sell faster than Apple can make it. Because a purchase is not always rational and Apple is now a luxury brand. Like Rolls Royce, Prada or Rolex.
Which is a shame... I liked it better when it was a technology company.