I have, for years now. Coming from a former all Windows (and a couple years on an MBP) user, it's perfectly fine. I have a dual boot, so whenever I need windows, I can use it, but it's becoming less and less frequent. Nowadays it's usually only for games.

Reading through this thread though, I'm baffled by some of these issues. I have been using the latest Ubuntu release for the past several years, on a variety of machines (T440s, 2 self-built desktops, a Lenovo Legion) and haven't experienced any problems to the degree others have mentioned. Out of the box support across Intel, AMD cpus, no graphics issues, nothing with scaling or extra monitors, never, on any machine. I did notice one problem when I updated to Ubuntu 20 about six months ago that my left Gsync monitor was acting weird, but I just disabled gsync and it runs perfectly fine. That's it in the past 5 years of using Linux as daily driver.

I work as a software engineer full time so maybe I just don't notice "issues"? As the old saying goes, it works fine on my machine(s).