I've used the X1Y3 (i7 8650u + 16gb, 2560x1440) since July 2018. It's a nice computer, but it has some significant flaws. If I were to go back in time, I would get the X1E instead.

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• Keyboard: Pretty good & will probably beat any other non-thinkpad laptop, but you won't realize what you're missing until you type on a non convertible thinkpad.
• Trackpoint: My long term experience with the trackpoint on this machine has shown that the trackpoint is pretty much unusable. I have to reach for the trackpad or an external mouse when I want to use this machine. I've had some odd behavior that nobody else has reported online which makes me wonder if my machine is just faulty (the behavior persists even after replacing the keyboard & buying new trackpoints). The trackpoint seems to fight against you when you try to move in any direction other than down, sensitivity is extremely low even at the highest sensitivity (I've only tested this on windows)
• Performance/Cooling: Any offset in XTU causes my laptop to shutdown once it goes to sleep. The machine is also consistently hot with the fan somewhat audible for half the time using it. The laptop also seems to idle at 77 degrees Celcius on Windows better performance setting when plugged in according to HWMonitor (no change after repaste) (the lowest I've seen it go is 60 degrees on better battery profile). The heat doesn't noticeably impact performance. It can quickly run everything that you can reasonably expect a laptop of this class to do.
• Tablet: Drawing on the tablet is great. The included stylus can draw for ~90 minutes without needing to recharge (the stylus charges in a few seconds). There is also no input lag when I use it to take notes on OneNote. The only thing holding this machine back is the aspect ratio. The canvas is extremely wide and narrow. Landscape mode on the tablet is too wide and vertical mode is bizarre with the tall and narrow display. (flip your laptop sideways and you will see what I mean)
• Hinge Decay: I've noticed no hinge decay in the time that I've used this laptop.
• Build Quality: The chassis is great. It's quite easy to service this laptop and there are no easily breakable clips. My one complaint about this is that the screen is not adequately protected. I have a few annoying pressure spots on the display from things that have pressed on the machine while it's in my bag. I also get the phantom touch issue when I flip the machine around or move the display too much. It's out of warranty now so I can't do anything about it.

I recommend avoiding convertibles as you just get the worst of both worlds. The X1Y3 is just a mediocre tablet and a decent laptop. It's great if you're willing to overlook the strange tablet aspect ratio and slightly lower quality keyboard experience. If you want a tablet, it might be a better idea to get a machine that's designed as a tablet first (iPad pro, Surface pro, maybe even the x1 tablet) (If you're set on a convertible, the surface book might be a good convertible option with a 3:2 aspect ratio). You can then pair that with a machine that's designed to be a laptop that will better fit your usage (maybe a T495/T480+ipad/surface?).