The audio problems with the C7 were unfortunate but more on the Intel side to have force pushed that with this generation of CPU while nothing was ready. I got it 6 months later at the moment where things were starting working. Never got much trouble for resting from sleep.
I am currently still using my old X1C2 from 2014. That's quite reliable by my standards. I would prefer to continue with Lenovo due to reliability and good Linux support (there is a dedicated engineer for that matter who is available on their forums and who help various distributions including Debian and Fedora to make things work). I was waiting for the Gen 10 but battery life seems disappointing on Windows, so I am waiting for people to test on Linux. Gen9 only has FHD+ or 4K+ (too low and too high).
I am currently still using my old X1C2 from 2014. That's quite reliable by my standards. I would prefer to continue with Lenovo due to reliability and good Linux support (there is a dedicated engineer for that matter who is available on their forums and who help various distributions including Debian and Fedora to make things work). I was waiting for the Gen 10 but battery life seems disappointing on Windows, so I am waiting for people to test on Linux. Gen9 only has FHD+ or 4K+ (too low and too high).