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.
Ultimate 2 wireless I use with 2.4Ghz through the docking station. It works well but it was annoying that the back paddles and L4/R4 buttons (secondary bumpers) could only be mapped as another button, instead of being their own function. It will be nice to have the extra buttons if that is what’s working now. I had the beta firmware on them but steam still did not recognize them yet (but the beta firmware did allow Switch 2 to recognize them!)