I have to say I wasn't real impressed with the demo songs, though I definitely hear the Gacktiness. Maybe they should have selected a demo with more baritone or bass.
And, I'm not clear on how this gadget works. Can you make "Gackt" "sing" a track that's on your computer? Can you save the results? If I could hear even robo-Gackt wrap his golden tonsils around some Lully or "O Fortuna, crescat luna" it might be worth the price.