A transman, who is on my facebook, recently went for an important surgery. It was to remove the breasts off his chest. He was a lot happier now that they are gone. From the pictures, I know they where large, probably a C-cup, which must have been quite uncomfortable and heavy.
I understand that men perceive having breasts differently from women. To me, it is a wonderful thing, the bigger, the better, more to play with. However, to him it is on obstruction, something unnatural and useless to him, making him feel emasculated.
I know that their are men who choose to grow breasts and produce milk, but its from someone who wants to enjoy the experience. Search for male lactation on Google.