It was such an awesome plot twist that Sigma was really the one working for her the whole time. To think the Head Honcho that X and Zero had been facing against 8 times before had always just been another servant to someone much greater.
It was a lot like the plot twist with Bane in Batman Dark Knight, but cooler.
Well... at least I can actually tell if he's a male XD. But seriously, I do love those overdrive attacks and even though they are eight orbs, they remind me of the Chaos Emeralds (from the Sonic the Hedgehog series).