I put Goldleafs in all my button mash games, my NeoGeo cabs, GnG, a bunch of others. Personal preference when you play games that need repeated button smashing. Mainly just for feel of the button. I got on them a few years ago when I tried them in my NeoGeo and realized a really liked the throw and the sound. Yeah, they arn't original, I'd Never put them in an Atari cab, or a Nintendo game. But the odd Capcom game, TnF, Absolutely.
I HAD the original leafs and some Dynamat in my TnF CP, but after a week I pulled them in favour of the Ultimark ones. Less resistance, nice return, better sound, softer feel but not slower, very snappy. Less fatigue when mashing. Yeah, I had to crimp on the smaller terminals, but it was a quick change and definitely worth it.
TL/DR: It's weird, you know how some controls just FEEL like they match the gameplay? Nintendo sticks playing DK for example. You'd never put a HAPP stick on a DK, just doesn't feel right, ...these ones just felt right for most of the events in TnF and HS.