I've seen great A-cups to D-cups, natural and enhanced. While I have a tendency to favour natural, that may just be because I've seen way too many bad enhancements. Too often a woman gets bolt-ons way too big for her body size (bigger is often not better in this case) or they are too hard and shaped like melons. I've also seen several lady friends get unnecessary enhancements, including my ex girlfriend, who I personally think looks a little ridiculous now. No bias there, I swear! :biggrin1:
If you're considering getting a job done, I wouldn't go up more than two cup sizes, and if you're already a C-cup or higher I'd say you're wasting your money and risking unnecessary complications.