Basically, I can say that I already have one or the other K&F filter. So far I've always been satisfied and this time too.

I had originally bought a few cheaper filters from another brand for my Osmo Pocket 3.
A Black Mist and a fixed ND filter.
Working with fixed ND's usually annoys me so much that in most cases I simply omit them completely and work at the shutter speed. (And I don't really want that.)
But the fixed ND may or may not fit. And I don't want to carry around 5 more filters and always have to change them.
The variable filter included in this set is really great! Because it simply has to be put on once and then I can adapt it to the respective image without having to touch the gimbal all the time and leaving fingerprints all over the lens and filters.

And it was very important for me — as I really like the look — that I can combine my Black Mist with the ND filter. (Shown in the video) Because I don't want either or, but both.

In short: Top filters! And recommended.
But only, of course, for anyone for whom it is important to get the last few showpieces out of video aesthetics.
Most people won't notice and won't care if they just turn up the shutter speed and good.
Anyone who always has the camera on “auto” anyway doesn't know what to do with the ND filter anyway.
The included wide-angle filter as well as the polarizing filter and the black crap could still be interesting.