The stability of the diffuser is in the long term is not yet in sight. By design, the rim of the cup is strong under tension and could tear at frequent changes when the plasticizer evaporates early.
The homogeneity of the milkiness in my opinion is Ok, but just no comparison to more expensive variants.
However Why 4 small depressions, perhaps spraying process Caused must remain in the cap is beyond me. However, I can not imagine that these adversely affect the spreading quality to me.
My tests say the cup is doing what it should, no more, no less.
If he made to last, I am pleased all the more for not having taken the more expensive product.