Last year I had to use a Dell 7540 (may have the exact model number wrong, but it was one of their enterprise "workstation" laptops) with Ubuntu for work. I was also skeptical for the same reason as you, not having used Linux as a daily driver for a long time.

FWIW these laptops were rock solid and ran Linux just fine. Sleep also seemed to work as well(I'd have tried hibernation if I knew how. That's my preferred mode on Windows to save unnecessary power consumption).

I was quite impressed and while my personal daily needs are fully Windows-based, I would not hesitate to recommend those laptops to anyone who wants to get away from Windows.