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 to fit a 24-105).

Experience has shown that screw-on filters are only partially usable (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 quickly overwhelmed. Set a focus manually, e.g. 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 put a focus. Set the polarizing filter. When everything is ready, you can easily 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 practical bag.

I don't really want to talk about the space requirements. The screw set is definitely more compact, 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's worth more to me at this point.

What I particularly like about this concept is the fact that you can now buy gradient filters and the like afterwards and adapt the set the way you like it.