I tried it and wasn't disappointed, easy to use but was too big to carry around for my type of photography unless you use only one lens, but it's too much headache when you keep switching lenses.

So i returned it and went with the magnetic filter from same brand which is perfect for me.

Se acopla fácilmente y no deja entrar luz directa entre soporte y objetivo, estoy encantado con el, muy facil de poner y quitar y los filtros son de muy buena calidad.
Lo recomiendo para gente exigente en fotografía, muy buena calidad.

First impression is very good. No wishes open.
Note for customers in Germany/EU:
If you want to return an item (because you are not happy with the product) you have to send it to Chine on your costs.
So K+F yes but I would go for a German Online Photo store...

Love the rapid release frame and the secure fit of the CPL, along with the easy rotation. No evidence of colour cast when stacking filters. Carry case is good quality also.

Visually, the filter set is of very high quality. The optical quality will have to prove itself, but I don't have the slightest doubt about this.
The only point of criticism is that the very nicely executed leather storage box/pouch is very large in size, which makes transport in a backpack almost impossible. It would be better to provide the filters individually with a protective pouch. Transport would be easier and more customizable.

Innovative design; gorgeous packaging, very efficient and prompt delivery -- what more could you ask for?

excellent filter system. Very easy to use. Ordering from k&F Concept is easy. Highly recommended.

Haven’t had a chance to test in-field but upon receiving this item, it seems to be very high quality. Shipping to US from China took a while, but it made it and item seems to be what I was looking for.

Advantages: large, 92 mm polarizing filter, easy to rotate in the filter holder, filters come with plastic frames with grip lip, practical filter pocket, unfortunately only for the square filters, polarizing filter and holder, graduated filter too large. Disadvantages: Filter does not seal the light on the holder properly, there is a gap of 0.5 mm, only 2 sliding filter inserts, filter holder has some play and rattles a bit.
The ND 1000 has a magenta color cast and is easy to correct in image editing. All in all, the advantages outweigh the benefits, I can only recommend it. At Rico Best “filter photographer”, you can buy a plastic protection, “filter guard”, there are different sizes, order the right one.

I bought this filter set for landscape photography.

Before that, I had been traveling with a screw set from another company. I was then able to screw that onto exactly 1 lens. (I got it for a 24-105).

Experience has shown that screw filters can only be used in part (in my opinion).
If you use an ND 8x filter, you can safely screw it onto the lens and work with it. However, as soon as it gets higher, the camera is overwhelmed. Setting a focus manually, for example, is an impossibility, with a permanently installed 1000x filter.

This set allows you to set up the camera in peace. To compose the picture, to set a focus. Adjust the polarizing filter. When everything is done so far, you can relax and add 64x or 1000x and take care of the exposure.

The whole set is incredibly easy to use. Each filter is placed in a frame, which in turn has special handles.

The set comes in a handy bag.

I don't really want to talk about space requirements. The screw set is definitely more compact, but handling is simply more important to me at this point.
This kit allows me to mount the filters without leaving grease finger marks on the filter. That's worth more to me at this point.

What I particularly like about this concept is the fact that you can now buy graduated filters and the like at a later date and adapt the set as you like it.