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Great quality lens filter - but at an eyebrow raising price. The quality of this filter is flawless, I can't see any image degradation, but to be honest I can't see degradation from much cheaper Hama or Hoya filters either, at less than half the price.
Any ND8 filter reduces light entering the camera by 3 stops - (so a shutter speed of 1/1000 would become 1/125 at the same aperture and ISO, for example). I have seen cheaper filters give the picture a slight colour cast, but this one does not. The construction is solid, the threads are made of high quality brass and screw in firmly but not don't lock to the thread (a problem I have had with cheaper or second hand filters)
I typically use this for video outdoors when I want a lower aperture for creative reasons, and it works very well, does exactly what it says on the tin. I've never had a problem with this filter.
However, at the end of the day a filter is a reasonably simple piece of optics and I can't see any difference between this and a Hama or Hoya filter which does exactly the same thing (reduces light by three stops) at a better price.