VERY interesting...Vidius, instead of being the sort of outright, obvious evil that Vader was, reminds me far more of Gul Dukat. He's almost Cardassian, the way he talks about the Empire and the State, and uses the appearance of charm and warmth to manipulate.
I am actually beginning to think this version will be HARDER to turn back to the Light Side (should that even be possible) than Vader, given the shades of grey. (I wonder if he's close to Vergere's philosophy of the Force? And no, I haven't read the books, but I know about that.)