The difference as I see it between having breast enhancements, and breast reduction, reconstructive surgery, or surgery to alter a hook nose, for example, is this:
Firstly, breast reduction is usually done because the weight of the breast is causing the woman physical discomfort. It also does not involve implanting a foreign object that could present a health risk.
Reconstruction after surgery, or correction of a severe imbalance, is similar to surgery such as rhinoplasty. In an ideal world, nobody should feel the need to have surgery to 'correct' such a 'defect', however, we live in an imperfect world where there are many people who are unkind to others because of their appearance. If your appearance deviates in a very obvious way from what is considered normal, then this can be hard to deal with mentally. Surgery is the only way that the burden of having to cope with judgement on a day to day basis can be removed.
On the other hand, it is perfectly normal for women's breasts to come in all shapes and sizes - some round and pert, some small, some droopy. The media and our pornifed, consumerist culture is trying to tell women that anything other than round and pert breasts are not normal when they absolutely are. This in turn creates a culture where (women fear that) other people will view them as abnormal. It is a vicious circle- the more that women alter their breasts, the more that small or droopy breasts are seen as abnormal, and the more that women will feel pressured to alter them.
What about the women who say that they had the implants for theirselves, and that there was no noticeable difference to the outside world because they always wore a pushup bra etc.
Firstly, it is sad that our society has created a situation where these women felt that their bodies were somehow not normal or undesirable.
Secondly, it is sad that their only remedy is to create a health risk for themselves (long term health risks through poisoning from the chemicals used undeniably exist even if most women consider the risk acceptable).
Thirdly, it is sad that the women don't have or feel that they can't get a partner who will appreciate their body for what it is (again, because of the culture that has create unrealistic expectations). Especially when such pressures only seem to come to bear on women, and trouble only an extreme minority of men.
Fourthly, each woman who chooses to have surgery to 'correct' a normal body is contributing to society's appreciation of such normality as being abnormal and undesirable. She is then making it harder for other women to freely choose not to have surgery and to take on health risks.
So no, I don't believe a woman's right to 'choose' in this situation should be applauded because a) she is not in fact making an entirely free choice, and b) she is making it harder for other women to freely make a healthier choice.