Imogen had a very interesting post recently (on InsideOutStyle about breasts and the female body image, particularly from the perspective of being a large-busted woman who is considering a reduction. I found it a very interesting and thought-provoking read.
http://www.insideoutstyleblog......easts.html
My bust is quite large as well (these days, around a 32G/H) but I'm very very fortunate not to have pain and discomfort from them - unless I'm wearing a bra that doesn't fit! My back doesn't hurt, and my posture is pretty good (probably a legacy from a decade playing the flute - you have to have good posture to breathe properly!) Also, while I do need the support of a good undergarment, my breasts are in reasonably good shape right now. So surgery is not on my radar. Despite the inconvenience of finding bras and clothing to accomodate my bustline, I actually do like my hourglass shape, and (at the risk of sharing TMI) I also like that my partner really likes this aspect of the way I look.
However, I realize that not everyone with a large bustline is able to avoid pain - and I'm also young, so this could change in the future.
So that being said, I reserve the right to change my mind about the surgery issue in the future depending on my comfort level. I had friends in college who had reductions that they were thrilled with due to the freedom to move (and run) comfortably for the first time in years.
Imogen's comments about breast size - and breast cancer - also struck a chord with me. Two of my close relatives battled breast cancer - my grandma had a full mastectomy and reconstruction when I was quite young. We've determined that my sister and I are not at a genetic risk for breast cancer any more than other women in the general public; however, the fact that it runs strongly in my family makes me wonder what I'd choose to do if it ever happens to me, and how I'd re-adjust my perception of my figure/body image.
Anyway, her post is well worth a read if you're interested.
(ETA: And for another good read, here's the article on Mamamia that Imogen referenced in her blog: http://www.mamamia.com.au/soci.....eductions/)