I am thinking of sizing down to a 30D on this bra, and would therefore replace the 30E. I've worn it twice for a few hours each. It's just too full in the cups. I would offer it at my cost ($25 plus shipping).
I'd say the cups are smaller than a usual 30DD but not by much, yet the band seems more forgiving than some 30's I've worn.

EDIT: going to keep it and try to make it work. Have I mentioned it sucks being between sizes??