Despite the fact that this is a convertible plunge bra and I am rather well endowed, the bra is holding up well and seems fairly supportive. Because it is a plunge bra and it does not fit me perfectly, the support isn't near as good as something like a balconette bra would be.  to The bra fits well enough that I kept it, but just barely.  Based on this bra and another bra I have by the same company, I would say that it might pay for everyone to get an extra "letter" if it's an option or, if not, go up a cup size... So if you're normally a 32F, get a 32FF or if you're normally a 34DD, get a 34E.  I would also like to note that this bra is UK sizing which cannot be properly converted from US sizing using a chart.  If you want to order a bra from a UK company, you should really get fitted by someone in your area who uses UK sizing.