I have been very happy with my X1 Extreme. I did have an issue with the keyboard and later the touchpad, but I paid for onsite support so it wasn’t a big deal. They came out a day later and fixed it right there at my dining table.
I would say buying a ThinkPad is worth it for their paid support options alone. When I had a keyboard problem on my old MacBook, AppleCare took like 10 days to fix it. Lenovo’s premium support is reasonably priced and they don’t mess around. A person picks up the phone when you call and they treat you like you are important. If it’s a hardware problem, they are not fucking around. They don’t care how it happened or ask a bunch of questions. It’s covered and they are fixing it. Fast.
The X1 is also super easy to work on. It’s easily disassembled with normal tools and upgradable parts like SSD and RAM are right there when you open it up. They don’t do dumb things like solder in the RAM or leave you without an open slot. This thing is designed to be repairable.
Linux support is flawless.