I took it twice so far, just for kicks. Both times, the quiz has pegged me for the New Yorker I am--New York, Newark/Paterson (in New Jersey) and Yonkers, NY, to be exact. It's interesting, because I'm from Queens, which has its own very distinct accent.
You know Fran Drescher, the Nanny? Grew up in the neighborhood I grew up in. I think she even went to my junior high. I don't sound like her---I've lost the worst of the accent a bit, though I think I'm still distinctly New York in some of my speech patterns and vocab. I would have thought that a little bit of Boston would have rubbed off on my speech, having been to college there, but other than the fact that I can dip into Bostonian when I choose, apparently it has not.
The quiz says "sneakers" is the reason why I "sound" like a New Yorker. I love dialect quirks and accents.