I have the "old X1 Carbon with a low res screen", except that the article is a little inaccurate: it doesn't have to have a low res screen. You can select a 2560x1440 screen. Even better, it's a
non-reflective (matte) screen and even has a non-touch option! I guess I'm not alone in disliking reflective screens.
What sold me more than anything, though, was that I could select the best parts without being forced into a touchscreen. In so many other company's product lineups, if I wanted the 1440p screen (or whatever is highest), they were convinced I absolutely wanted a touchscreen, yes sirree! Thank you, Lenovo, for understanding my needs.
I don't remember which manufacturer it was, but I remember one option page where if I wanted to select the Core i7 option, it required the touchscreen upgrade as well. I don't see any logic behind that at all except "Hey, that i7 means you must be a big spender, guess we'll milk you for all you've got!"
As for OS, I run Linux Mint (Cinnamon) currently and experience no particular hardware or driver issues. Battery life is 5-8 hours depending on load, screen brightness, etc.