I was super skeptical based on the mixed reviews for this product, but ended up being very happy!
I purchased two of these in a 3X and they fit my 46DDD very well.
My purposes:
(1) for night/lounging
... very comfortable to wear around the house
... fabric is very lightweight and does not pinch or grip sensitive areas
... was more sheer than I expected, but not disappointed at all
(1) to wear under swimsuits to give extra support
... excellent for giving extra support
... dried out very quickly, yay!
As a large-chested woman I know to expect that this is not going to give me 'perk' and that it will do a uni-bewb, which I'm fine with.
I like that it feels comfortable and secure, and nothing is digging in anywhere.