I love love love this bikini top- it is probably the most supportive top that hols me up and doesn't kill my neck- of any bikini I have ever had. I am a solid D cup almost a DD and I got an E in this bikini that I would call a D cup. So if you are a true DD or E- I don't know if I would count on this one- or plan on some extra skin showing....
I am extremely active- swimming, water aerobics, and scuba diving in this top with no problems and great support.  Why don't more swimwear manufacturers make these X back bikini tops for larger cup sizes???