i had unders, and have had none stop problems with them, but it doesnt mean everyone will. my re-op i will be having overs, and im not overly happy with that
unders (partials) are placed under the first layer of muscle, so they do cut into it. this usually doesnt cause many problems, and actually has less risks then overs. they are given to girls with very little breast tissue. i wouldnt worry if this is what you have been offered, your surgeon knows best xx