That'd be awesome if you could post comparisons. I've only picked up the Hoya HMC ND8 right now. I was debating between Hoya or B+W for ND400 -- probably B+W since the price difference isn't huge.
So after further readings, I came to conclusion why I often see the phrase 'video guys love vari ND filters' which does not apply to photographers. Video guys use them because they are quick and convenient. However, they are primarily using it as tool to control aperture and recording speed. While that is something in common with photographers, the difference comes that we often use it either for really long exposure shots or telephoto shots. And for a photo, a single frame's image quality is much more desirable than a rolling video, and that's when these vari filters really show more issues for photographers.
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