I've picked up a number of filters from K&F lately and they have all been great, well machined, easy to adjust and fit well on my lenses. This one is no exception! As others have said, there is very little color shift with this and at all the settings you get a nice clear view with no variations in brightness across the filter.

If you shoot in places that are almost always brightly lit with direct sunlight, you know that even after lowering the ISO sometimes you still can't reduce the shutter speed enough to get a nice stylistic motion blur on flowing water or waves on a beach. It can also be hard to get the iris opened up to where you get a nice depth of field blur. With this filter going all the way up to ND64 you can easily get the light low enough to take these kinds of shots. While everyone likes tack sharp photos you get with high shutter speed and high F-Stop, sometimes you just want a different look and this will let you get it. From a shallow depth of field shot to focus people on the main subject to a more motion blurred shot to give you the sensation of movement. This can also be used for recording videos. In bright light you often have to turn the shutter speed up which makes the video seem to stutter when you pan. With an ND like this you can pull the shutter speed back down again to get that more "cinematic" look to your videos.

Overall a good filter that I'm really happy with. The only thing is I wish K&F was a little more consistent with their cases. Some filters come in a plastic box, others (like this one) in a little leather slip-case. Regardless of which kind of boxes you get, they really aren't marked all that well so if you carry several it's not always that easy to tell which filter is in which case without opening them and looking. But that's a small thing. All their cases are sturdy and protective as they should be.