I haven't played DDR in a very, very long time (we're looking at a decade here, lol). I don't think I've ever played the other one, or the one Chancey showed. ^^;
I think games like that have merit, since they're a form of exercise (one you can fall back on if the weather is terrible, or to break up the monotony of your usual indoor workout), but for some reason, I just never wound up buying them.