The Genus seems to be an attempt at a poor man's Singh Ray. Depending on the site you find the listing, it claims adjustable up to 8-stops. The downfall is, there is no clicks, and there is no hard stop. There is a "guide" printed on the side of the filter.
Here's my results to a "controlled" test. My lights are cheap, I didn't use a tripod, and I'm using a 50mm lens for a "product" shot, so obviously take these results with a grain of salt.
These shots should've been roughly the same exposure, although they don't look like it. First shot is bare lens, 2 150w/s monolights at 1/8 power. Second is with the Genus, same in camera settings, but the Genus dialed in to 3-stops, and the lights at full power..
I fired the rim light so that it should create flare. I faced it more towards the camera than it should be. It seems that the flare shows much more green, as opposed to the bluish flare the bare Nikon coating creates. There is also a fare amount of white flare on the opposite side of the light source. There is ghosting right above the subject in both frames, and I verified it's not dust by looking at other photos before and after (would be a big chunk of dust).
Anyway, like I said, not something that is definitive, but it's a little info for those curious.