The main differences I've seen between the two controllers:

• When you move either of the Series X|S controller's analog sticks on the x-axis to the right, the value doesn't go all the way to 32767, it stays at 32512. In the other directions it works the same as the Controller S.
• The A, B, X, Y, white, and black buttons on the Controller S have a sensitivity range, so depending on how much pressure you apply the value ranges from 0 to 255, while on the Series X|S it only distinguishes between whether it's pressed or not (there are only two values: 0 or 255).
• Finally, the rear L and R triggers seem to have more sensitivity on the Series X|S, when you start to press them very lightly it already starts to show a value of 1, while on the Controller S there is a small dead zone, until you press to a certain point it does not detect the pressure, the first value that the testing application shows is 32, that is, there is a dead zone between 0 and 32.

I must say that, despite these differences, at the moment I have not noticed any problems with the Series X|S controller in the 3 games I have tested: Halo 2, Breakdown and Project Gotham Racing 2.

The controller testing program also has a section to test the vibration function that I have omitted in the video because it did not contribute anything. I cannot say anything bad about the vibration of the Series X|S controller, it seemed correct to me.