acording to akatsuchi, it would of wiped out the entire turtle island and from the look of things its quicker to use so i'll go with this, i hope we get to see it

Agreed. "Dust technique" sounds pretty lame, but I'm willing to bet there's something more to this old guy with severe back problems.

I bet this is really powerful

Deidara being a 'brat' is part of his design. XD The brat always loses to his mentor, especially if he gives up on his ways and comes back years later...