Thanks for the replies, was starting to wonder if there would be any. From the reading I've done, customer reviews and etc, I agree with
@duwen above that the OEM membranes are more important than the buttons. But I see all kinds reviews on buttons (not just FP but also RetroSix "Prestige" and etc), from "trash" to "perfect." And you're left wondering if some "reviews" are just paid shills.
It's not that expensive to experiment I guess, but even if they're bland looking you know you won't go wrong with the real ones.