Oh, then I have barely scratched the surface of what is capable with them.

I upgraded from my aging DS4 to an Ultimate 2C, and it was night and day. The buttons are sharp (some on the DS4 started to become sticky) and the hall-effect sticks are incredible: I felt that my inputs were much more precise out of the box, and in Steam you can reduce (and even eliminate) dead zones.

I would only upgrade to a Steam Controller for the trackpads, but I don’t think I play enough games that would benefit from them to justify the purchase (maybe if I played more third-person platformers/shooters like Lara Croft and Uncharted)

Edit: forgot to mention the additional buttons. I don’t use them on the 2C because of their awkward placement, whereas Valve placed them next to the grips on both the Steam Deck and Controller. I find the latter placement much easier and natural, it was quite useful when I played Half-Life 2 and Portal 2.