My only complaint is that the vocals seemed a little too edited for my taste. I saw a live video of that song and it sounded a lot better as appose to the studio version. One rule of thumb I've found for harsh vocals is this: the less edited, the better.

There is some editing..I know there is frequent use of a doubling effect. But on the plus side..the editing doesn't give him a fake sound..he can still reach the notes live. Even better..a lot of live performance I have seen on the Tubes of You have them performing a song at the end of their around the 30th song or so..and despite Kyo being obviously tired, he still pushes those amazing screams and growls out.