I'm a very large cup mama (went from F to K from kid #1 to kid #3) and I've found that nursing bras are such a waste for me. They offer very little support and, if they DO seem to offer support, they tend to fall apart after about 3-4 months. I had a Bravado that did that. Loved the bra, the nursing flap hooks broke off after 3 mos.
Since you're supposed to stay away from underwires as a breastfeeder (especially the first few months) for risk of mastitis and clogged ducts, I usually just get a few regular, non-underwire bras. I can't even shop at Walmart or VS or anything for mine, so they are always expensive, no matter what ( I have to order online). Then I just lift up one side for every feeding. Its quite convenient for me. And its just as hard to snap the flap for me as it is to put the girl back in her holster, so it makes no difference there, either. LOL
<hands in the air> Sucks being a big breasted gal sometimes.