I own 4.
My very first was more of a breast enhancer, and now that I look back on it, the enhancers were very tiny and made me look like a girl that just reached adolescence.
My next set was supposed to be a C cup. However due to my bra band size it was obviously meant for a much smaller bra band size. So on me it looked weird and very disproportionate.
I bought a full torso breastplate, advertised as a C cup. I really regret this purchase, it was expensive and the breasts were not realistic whatsoever.
My current ones are a B cup for my bra band size. I’ve been using it since I bought it and this pair definitely looks and feels realistic. Well worth the price of admission.