These controllers were all working on SteamOS before as far as I know, so I’m interested to see what this changes. My understanding is that previously their controllers just show up as generic xbox controllers, and now they will be properly recognized. We’ll see if this has any other benefits like custom bindings for back buttons and things like that.
My Ultimate 2 wireless lets me bind the extra buttons to any command as well as detect and configure the gyro controls. This is with Steam Input; so you can bind those buttons to keyboard and mouse inputs.