Maybe this is just ridiculously uncommon, but I've been looking for a price drop on these, so I just ordered a fightpad. I don't even own SFIV, or any fighting games. I'm terrible at them.
I got the pad since I like playing games like N+, Castle Crashers, Bionic Commando, etc. with the D-pad, and it's in a bit of an awkward place on the standard 360 controller to be using all the time. So I can justify this just like how I justified buying a Hori digital controller for Gamecube to play Game Boy Advance games, Mega Man, and so on. Plus it's got turbo, which comes in handy for a lot of different games.
My $0.02.