The Dead or Alive 4 arcade stick works wonderfully with it.
I like it a lot, wasn't sure at first, AI difficulty is insanely hard, like it always was I guess... finally beat it on default the first night and went to online.
Online is freaking amazing. Even bad ping connections play good. I have a decent connection but fighting games online have never worked too good, SF is perfect. Bravo capcom for making the online fighting a priority in development and making sure it worked.
My only complaint is the still limited (2 frame) animation in the background. Back in the day it was understandable, now days it's not. Takes me out of the game when you have these fully detailed characters and backgrounds and they move all janky. Arm up... arm down... arm up... arm down. Cheesy. Otherwise no complaints, 9 out of 10.