I purchased the diffuser, because I shoot often in clubs and discos. I was told that these "things" a lot better "illuminate" the images, so I ordered it. The chosen product fits really well on my Nissin Di866 flash. Although it is a little more difficult when plugging, keeps the diffuser afterwards so much the better! As I unpacked the product, I was a little surprised to be honest. Because there was nothing but a small white plastic box with four strange rings on the surface. It is good that the diffuser on the material here is "flexible", so it can not easily cracks or the like. The pictures are with the diffuser actually better than without, even if the flash unit has this integrated white reflection map or a scattering stop a lot. The illumination is much more evenly. Only in more distant / recordings you should remove it.
One point deduction because that touched down just slightly friemelig. Ansonten good articles on decent price!