Re: "the inevitable white glare induced headaches?"
Yes, 100-120 nits maximum brightness, fairly accurate white point, ambient light coming from the side, and a flicker free monitor - it's very nice. Never felt the need for dark mode myself, I still find text less tiring to read black on white.
OTOH I understand the curved ultrawidescreen crowd using dark mode, if they are not hyper-focused on keeping their windows organized and sized to their liking.