The street fighter games are just a little cramped. Usually both players have to sit a couple inches the other way than normal, but it's not bad. It really doesn't effect your play at all. Looking back, I wish I had built the side panel with the joysticks and buttons angling away from each other, like a "V". That way each player would have plenty of elbow room and could have also straddled their respective corners.
I'm really glad I added this side panel and I don't even play very many fighting games. It's just great for a little two man joust, '88 games, and every stupid side scrolling game. Not to mention the battles in R.B.I. baseball and Baseball Stars for O.G. nintendo. It's also nice to play with the whole screen on every game, whether vertical or horizontal. And the joysticks are perfect for a little Crazy Climber and Robotron(my fav).