This is a really cute bra and seems well made; however, the design just doesn't work if you have a large chest.  I am one of those people that can't do underwire (unfortunately) while nursing, but a truly supportive bra in a F+ cup without underwire is a VERY difficult thing to find.  I was reasonably happy with this bra when I received it so I didn't send it back, but the more I wear it the more disappointed I am with it.  Maybe it's because I did actually find a supportive, comfortable, functional wire-free nursing bra (finally!) and now can't stand to wear anything else.  This one has been relegated to the back of the drawer.
Bottom line: if you're a D cup or smaller, this will probably work for you.  Larger?  I can't recommend this one.  (But I can recommend Hotmilk's nursing bras ;-))