Your positive experiences with this, do not mirror mine. I have one 4K main display at 200% scaling, and an old 19" off-screen I use for IRC and music playback at 100% scale. Every time I wake my machine, the windows from the off-screen are shuffled around to the main screen, and windows on the main screen are resized and moved around. It absolutely drives me up the wall, and it's clear that this configuration has never been tested by anyone at Microsoft.