A friend and I recently bought a pair of MLG arcade sticks directly from Madcatz, and when we first used them, we noticed that the 6 white buttons felt different from the sanwas on my friend’s eightarc. We initially didn’t think much of it and assumed the springs were simply slightly stiff from being new. Out of curiosity, I opened up the stick, but I can’t positively make out whether the white buttons are 100% non-sanwa. I believe the grey/black ones are definitely sanwa.
As for feeling of the buttons, the questionable white buttons have a “hollow” feeling when pressed, compared to sanwas, which has a more “solid” resistance when pressed. Another note is that the white buttons do get stuck if pressed near the edge (it will kind of stick to the housing). Hopefully someone from the community can confirm whether the white buttons in the sticks are real sanwas. Thanks.
Here are some pictures of the buttons:
Compared to the grey, the white buttons are taller.
Curvature of the white button is slightly squarer.
Sanwas have more rounded edges.
White housings are smaller than the Sanwas
Grey/Black ones explicitly say Sanwa
Lack of any branding.