I had a BA because I gained and then lost 80+ pounds over the course of about 6 years. At the end I had at least DD skin, with maybe A cup tissue. I practically became an engineer with the various bras ect that I used to look ok in clothes. Swimsuit was impossible to hide in though.
The only con I can think of is that sometimes I feel a twitch when I pick up something, or push down on something using those muscles.
Pros- clothes shopping became so much easier. People thought I had lost more weight because I was proportional. Much more confident about my body, wearing swimsuits, work out clothes ect.