I think DC Cooper's voice was what I liked the least, actually. But vocals are always a varied taste, so I didn't let them bother me as much as I would've usually let them. What did was the lyrics. On paper it seems like a really great story, but things like introducing Tommy 3 songs before the album's end really bring it down.
Funny, I actually got 2 copies of the Chrome Shift album by accident, so I gave one to a friend of mine, and the only Progressive anything I've been able to get him into was PoS's Scarsick.... Haven't heard it yet myself, but, hey, I've made worse and more costly choices if it's as you say. I've only managed to hear Voice in the Light and Akphaezya's Anthology II of the albums I got (nearly everything, gonna have to stay away from things that cost money in general), and holy damn is the latter a fantastic breath of fresh air. Wish I had known about it sooner. Could do without the growls, but there aren't a lot, and considering how beautiful the vocalist's voice is and that, from what I've read, her solo career is similar to Tori Amos's, they're not bad, and appear as much as the growls on Haken's Aquarius: two lines and one movement of a song. Tolerable for someone like myself who doesn't like growls in their Prog.