I moved from Mac to Pop (on a Dell XPS 9750 w/ 4k screen) about 3 months ago. Honestly the OS has been pretty much fine. When I installed it was on Pop 19.04, and I had to manually update to kernel 5.3 in order to get some hardware support, but now that kernel is included in Pop 19.10.

I find the contacts/calendars/mail programs to be overall less functional than Mac OS. Not terrible, but it is taking some time to learn the sharp edges to avoid. Geary is their default mail client, but it doesn't support a unified inbox, and I have a lot of email accounts, so I bounced between a bunch of other clients before finally settling on Evolution. Evolution feels like a bad Windows business suite from the late 90s, but the fact is that it has the functionality I need, and I think I can learn to avoid its oddities.

Besides that, everything about it is very familiar to a mac convert. You can see clear areas where strong inspiration was taken from the Mac. It's honestly breathtakingly good, and it's free. I haven't looked back.

Overall, I'd say you should pick up a System 76 Laptop and give it a go. If the Darter Pro had been around when I was switching, I'd certainly have bought that.