I bought this filter set for landscape photography.

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

Experience has shown that screw filters are simply only partially usable (in my opinion).
If you use an ND 8x filter, you can safely screw it on the lens and work with it. As soon as it gets higher, the camera is overstrained. 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. Compose the image, set the focus. To adjust the polarizing filter. When everything is ready, you can add 64x or 1000x and take care of the exposure.

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

The set comes in a handy bag.

I don't really want to talk about the space requirements. More compact is the screw set in any case, but at this point handling is simply more important to me.
This set allows me to mount the filters without leaving greasy finger marks on the filter. That is 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 afterwards and customize the set the way you like it.