in many ways it is the best phone ever. However excluding the screen size coming from a plus, which is personal preference, there are many things that make it a phone I can't live with. Primarily Face ID. It is not seamless, it IS slower that Touch ID and it doesn't work in certain situations that I took for granted before with Touch, such as waking up in the morning, having to get your face/phone in the perfect angle etc, im not saying it doesn't unlock, but it's not quick or smooth in those scenarios. For some people this won't be an issue, but for me I cannot stand it, so much so that today it's annoying me so much I considered chucking it in the bin.
I have the same problems with Face ID. Especially like you said, when I am just waking up and my face is half sunk in my pillow and trying to unlock my phone. No big deal but those are the times Touch ID worked better. I’m keeping my X though, the pros definitely outweighs the cons. Especially how it looks, just an elegant device.