Hehe, I love DDR (and ITG), but that isn't DDR , its Pump It Up.
DDR doesn't have diagnal arrows, or a middle button.
It just has 4 arrows, up/down/left/right.
Hes doing freestyle though, and its not what most do Meh.
If you want to see real DDR skills, and actually getting AAA's etc which is the entire point of the game haha, search for Adam Styles in YouTube.
I can play those songs he's on, but could never get AAA's on a pad, though I can on keyboard (but thats missing the point).
But if you miss playing DDR or ITG2 I just start up stepmania. I play it all the time, around 6X speed hard or expert on the keyboard. Its the same feel but nothing can replace you actually getting up and playing DDR.
i love ddr/stepmaina. have it on my pc + have a dance mat. im great with my fingers, but can only do easy on my dance mat (as it sucks). in the arcades i can do medium easily. its all goood fun