I compete in gaming tournament(s), and I can say with 100% confidence, the Sega Saturn controller is "the go-to" controller for fighting games. The reason I gave this one a 4/5 because the A button seems like it sticks some. It does work/function yes, but at times the game(s) don't always register the button pressed when doing certain combos. I also have a Saturn to Dreamcast converter since I play a lot of Dreamcast fighting games, and again it doesn't always register during fast presses, but it does work when pressed normal. The other reason for the 4/5 because it was just the controller, no packaging. It's not a deal breaker, and no I won't fault the person selling it, but it would have been nice to have the box with it as well just in case. It is the official Sega Saturn controller, not some 3rd party garbage.
Here's the list of games I have used it on, and it did work 100% outside the A button situation like I mentioned earlier:
Saturn - Fighters Megamix, Darkstalkers, Die Hard Arcade, and X-Men vs Street Fighter Dreamcast (with converter) - Capcom vs SNK, Marvel vs Capcom, King of Fighters 99 Dream Match
I am open to the option of the seller maybe sending one that doesn't feel like the A button sticks, and I am willing to send this one back, but again it does function in case anyone asks.