I am not sure how that move could possibly be done without breaking an arm, but it is a pretty devestating attack, thank god I always have the Shadow Dash Chip in Z3, however, it absolutely destroyed me in ZX.
Yeah, I always hated how you could get the most hits in with a triple slash, the bosses invunerabily after hits always got on my nerves, and it lasted so long :/
Thankfully If you know how to execute a spinning attack or the dashing stabbing EX skill, you can dish out some decent damage, when battling Omega in Z3, I got around a 9th of a bar of heath with a single jump spin.
Either way, If you get past the whole evil trying to destroy Zero and assist Weil in controlling the world part, Omega's really cool.
(I've always wanted to do that smiley, AGAIN!