It depends on the original size of the breasts. If the girl had a b cup or smaller, they'll never feel right. Now 'look' is an entirely different question...the better the Doc, the better the look.
I remember a stripper who had the smallest of A's ive ever seen, but she really lucked out and got work done by one hell of a doc. Those tits looked GREAT. The nipples didnt point in any direction, the shape looked natural...just an amazing job. Another dancer got a set, she was a cute looking blonde with small b's....went a size too big and you can see the exact shape of the implant.
But the best implants are those that lift and support breasts that are already large but are starting to sag. Know a dancer that got this done...put them against my face and im telling you....i couldnt tell they had anything done to them. Best looking 'natural' DD's.