Bronica diffusion filters

I encountered a set of four diffusion filters for my Bronica (two each of black and white mesh with two degrees of diffusion). I have never used these on camera in twenty years. Has anyone had any experience with these? Are they worthwhile?

Thanks for any experience and insights that you have.

YES! I've found that they work very well indeed. They do a wonderful job of smoothing skin tones and hiding age lines. I tend to use the black ones more than the white.