I bough a high-end X1 carbon because I wanted to keep it for a long time and I trusted Lenovo. While I loved it and was very satisfied, it turns out that the main board suddenly died after 2 years, and it was not repairable.

They do not provide any post-warranty support (even paid) and do not sell spare parts.

Now I'm back to a desktop PC that I built myself and can repair or upgrade however I want.