You get to use variations of all of Omega's moves while in Overdrive.
It also has infinite Overdrive.
You get- (while in overdrive)
mid charge shot normal shots, double shot, (like with Model X, but both shots are the same)
Saber waves, (electric element)
Split Heavens, (Fire)
crescent waves when you do the spin slash, (ice)
3 kinds of ground pound moves, (which resemble Zero's ones from X2, 4 and 6)
you can also preform the old fashioned Shot Shot saber wave.
The drawback is that the saber cant charge in overdrive.