I think that it depends on the car, and the spoiler/wing. some cars that I see rolling around just look god awful with a big wing on the back, but some can pull it off.
I think the sonic can pull off some of the looks. There was a guy on here, Blazin28, who had a high spoiler on his sedan and it looked okay. it really depends on what spoiler you want.
can't tell too well in the pic there, but it looks like something like that would be okay. I'm not too sure on whether the supports would look better as body-colored plastic or that metal/wirey look.
all in all, it's your car. do what you want. some people will like it, some wont, but what matters is if you do. I get some **** for the rally lights on my car, but I think they look good, so screw everybody else lol.