I installed Mojave by upgrading a clone of my High Sierra installation, and I won't bore you with the initial traumas, because they all disappeared after a shut down/startup except that dark mode wasn't enabled as I had selected during setup.
It's sorta worth noting that Mojave booted when the installer said I still had 17 minutes to go.
So far, the only glitches I've noticed are my NoSleep menu bar icon won't draw...leaves an empty space, but clicking on the empty space does invoke its functionality, and Battery Health Monitor is dead...no big deal.
I'm working in dark mode to get a feel for it, and so far, I kinda like it.
