The filters from K&F-Concept are generally very popular, especially when it comes to price/line, and this magnetic set also ties in there.
As a set with CPL, ND8, ND64, you are definitely equipped with the most common filters for now. Even if the ND64 is not enough, you can of course plug the ND8 with it and further darken it out again without any problems. Of course, this is not as good as using a stronger ND directly, but when it comes to the quality of the K&F filters, this is honestly justifiable, as flaring and color shifting are not a big problem here.
I think it's great that a magnetic lens cap is included here. Especially when you use this set with other magnetic adapters for other sizes, you can forget the normal lens cap otherwise. With the magnetic cover, however, you are very flexible here.

The magnets hold together very well but you can still get the filters off. They are almost a bit too strong but would rather be so that you can then remove the filters very easily and they fall off quickly; that would then be much more annoying and impractical.

A small bag is also included. The bag is not bad, with a magnetic flap and then a zipper. Good combination, so you can completely close the bag when you pack it away or don't need it so much right now, but when you're changing a lot, you simply leave the zipper open and just close the magnetic tab. But this could be a bit stronger for my taste, I would be a bit afraid of losing the filters here.

There is nothing negative to say about the quality of the filters, the coatings make a high-quality impression and are highly recommended for my standards.
I also think it's great that the rear side of the filter is threadless so that it can be magnetically attached and removed without any problems. However, the front side is equipped with a thread, so you can still use magnetic filters that you may have otherwise.

All in all, a great set.
The price is of course not exactly cheap, but MMn is still justified, especially when you can then use the set with the respective magnetic adapter on various lenses.