Well, it looks really cool, but the fact that the opponent has to be at a ridiculous momentum to start with.... ehh, I don't see how many situations there are for that to happen.
I think most of the potential is in teams...you've seen the caped reversed Warlock Punch, right? And the Shoryuken -> Cape kills at 0% from a Mario grab? It's pretty tough to set up, but one hell of a surprise when it works.
I think they were testing this on Sheik/Zelda upB's, and it didn't work. Not that it would matter much.
Imagine if it worked on Shuttle Loop? Or Nado? I wonder if anyone has tried it on a reversed SL, since it works so well on a reversed Warlock Punch. There is a momentum change when you reverse the SL, isn't there?
Just went and watched it, and I have one thing to say.
O_O
If Marios can make this somewhat relevant, he's going up for sure.
The relevance is the key part. I don't doubt SOMEthing useful will come of this, though HOW useful is the key.
Do we have any psychiatrists in this thread? I think we may need one.
Is Orthopedist close enough?

Perhaps there's something wrong with the connection of the parietal and frontal bones...
I see someone walking in the middle of a busy street, getting clipped by cars over and over again. I point out the sidewalk, and he punches me in the face and keeps walking in the middle of the street.
I lol'd hard at this. Too good of a visual not to.
Mario's going to start tearing up Low Tier tournaments once people really start using him. Ness too, FOW might have started up some kind of Ness revolution with those wins in Vegas.