The filter is protected in a box for storage and accompanied by three wipes for cleaning vacuum-packed lenses.
The construction quality is very good, like all the K&F products I have had the opportunity to test.

Although I haven't had many occasions to use the filter since my “style” (so to speak) of photography does not require diffusion effects, I have been able to test it a little and the main thing I noticed was a softening of the image, although very little and a small decrease in contrast.
Both effects can be achieved in post, but if you are clear about the effect you want in each photo, the filter saves the time of having to edit.

I don't know why, but I expected the effect to be noticed much more than it does (maybe I'm doing something wrong) but this isn't bad either, it's just a matter of getting used to it and if I ever needed more, which I doubt, I can always look for another filter with a greater effect or add it to a post.

I liked the filter a lot considering the construction and the price it has and, even if it's not going to give it too much use, it's always good to have it in the collection just in case.