As far as I know there aren't any ceramic-coated Deep V's. It takes special sputtering equipment plus high temperature oven to apply ceramic coating (at least a ceramic coating that will stick) and Velocity doesn't have this. You may have anodized Deep V's.
Ceramic coatings have largely fallen out of favor. I think the only rim still offering them is the Mavic Open Pro Ceramic. It wears brake pads faster and offers weaker braking overall, but on first touch it avoids a film of water that causes something similar to hydroplaning with the brake pads. It's not very thick but it still will insulate the rim a bit from heating so the rim stays marginally cooler -- OK I suppose in hot weather but in the rain it means water doesn't vaporize as quickly. The one big plus of a good ceramic coating is that it protects the braking surface from brake wear. However, the majority of ceramic coatings I've had have tended to flake off in patches over time. A good brake pad and a bare aluminum rim brakes better and more consistently than anything else. If the aluminum is anodized, it doesn't really affect braking significantly, but I wouldn't worry about ceramic braking surfaces.