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.
Is there a symmetrical version, like a PS controller, or just the Xbox-like layout?
Pro 2 is symmetrical. Looks like a SNES controller with handles. The ergonomics of it are very different between it and the ultimate, and I prefer the pro 2 by a lot, but they are both good controllers.