Received my 1/8 filter around two weeks ago. I've used it on a number of jobs already and am delighted with the results.
I generally shoot video on prime lenses, which I love, but which can be a little too sharp for flattering features on subjects. The filter just knocks a little of that oversharpness off the image, giving a much more pleasing result.
It also works great on landscapes, giving a slightly softer, less digital look, without any hint of 'mushiness'. I expect I'll shoot 90% of my footage with this filter on now, so may well invest in several more and simply use them as a 'replacement' for my UV filters, as general lens protection.