It's not too often that something new and completely revolutionary slips into the woodworking world - let alone something that is really helpful to the average woodworker.
If I had to name some of the better inventions in the last twenty years or so, I'd have to include the Festool Domino, and maybe the Kreg jig.
So the question is - does this drawer dado blade works as promised? I see two potential problems that could occur.
One involves chipout, because whenever you're working with plywood, you have the potential for massive chipping, especially if that blade gets dull.
Next - when you're cutting your drawer material, the height of this blade is critical - too high and you end up separating the parts of the drawer. Too low and your joint doesn't fold together. So if your saw doesn't have a solid height adjustment on it, you might screw up a lot of plywood, trying to get it dialed in correctly.
But damn - this is really innovative and clever...I hope a blade company contacts this fellow soon!