As for the pad itself, find your nearest Konami representative and hug them vigorously, since your $80 will land you the game as well as what may be the best damned soft pad ever produced. With its lengthy USB cord (around ten feet) and clingy plastic base, the control is incredibly stable and responsive, even on carpet.
Even if this is the only version available on the 360, classic gameplay and a bevy of options warrant purchase over previous DDR outings. If all the gameplay modes still don't pique your interest, go deeper into Dance Dance Revolution Universe by scrounging for Achievements or serve strangers on Live. Just watch out for anyone named Smidget.