So there are a couple of issues which came up during testing which are out of our control, but are easily resolved. In both cases, I would suspect most steam users are already aware of the problems and the workarounds, but for anyone who isn't, here's some help for you.

Nvidia green strobing/flicker from boot

Open Nvidia Control Panel
Select Change Resolution
On "3. Apply the following settings", choose:
-Use Nvidia Color Settings
-Desktop color settings: Highest (32-bit)
-Output color depth: 8bpc
-Output color format: RGB
-Output dynamic range: Full

Multiplayer controller support:

UE will not allow for variety of controllers to be used so XBO controllers have to be used together, you cannot mix and match with other "generic USB or wireless controllers".