Sorry for late reply. Been one of those days where I had no free time at work, lol. You now its bad when you can't do much MR at work. <cough>
Switching between the default and the SMPTE - everything is brighter, chalkier. But mostly, things aren't as dark and the colors stand out a bit more.
I'll be honest with you, I am terrible at these color profile things and gauging natural / correct color, so I've stayed far from it all.
So I took out my phone and ... hopefully this helps?
https://photos.app.goo.gl/9XPrLBL4higeHCkB8
It takes the dark in the window colors and really brightens them up, makes them feel chalky. lol. But I could definitely get used to it. Definitely makes the pictures lighter.