Most of the Dept 7 classes, I've realy liked. Yes, they are overpowered but they tend to fill niches in the Modern setting nicely.
The Cold Bringer seems a little to niche to me. The powers are cool, and yes, it is also a bit overpowered, but it just seems to have too narrow a focus. It is a good class if you are looking to do a high-powered game such as Psi-Watch by the same author, but otherwise this class just seems a bit too narrow.
[3 of 5 Stars!]