I bought a 3rd gen X1 Carbon. Three weeks out of warranty, the display stopped working. The repair took five weeks and they put in the wrong parts, downgrading the CPU and RAM. it took three more weeks for them to even ship a new replacement. On every single interaction I was told something false about the repair process, timeline, shipping, etc - seriously, I kept a log. Every department pointed fingers at every other department, no one (even the "Executive Support" I was escalated to) even claimed to have comprehensive knowledge, let alone actually took responsibility for the process.
Read the reviews. My experience wasn't unusual. Would having no laptop for nine weeks inconvenience you?