Ordered a C & D, the fit seems more suited to an A & B cup. The support is really light for larger breasts, lift action for firm breast containment like I'd want for a low plunge isn't really there.
I have a couple of deep V tops. This bra works great with those! It's comfortable at the same time. Reading previous reviews, it said the cup size runs small. I'm glad I listened and got a cup size up and it fits great!