Oh no, I was looking to get an x1 carbon because of the supposedly great Linux support. What kind of problems where you experiencing? And was it the 14", or the extreme?
This was the 2017 14" X1 Carbon(not the extreme one). Mostly battery issues, it was holding up very less on sleep and in use. I was using Ubuntu and Ubuntu actually certifies the hardware. The keyboard was just plain awesome though. I don't think you would find a better keyboard in the slim form factor.
Since this was an office one, I returned it and continued on my 2014 rMBP. It might have been fixed now btw. I will also try the newer X1s I can before finalizing on one.