I have the contoured, but the reason I ask is because I saw someone post a question here saying their breasts are too big for the smaller size cups but their rib cage is too narrow for larger cups to fit side by side.
I was thinking that if the chest size is the limiting factor, would making the round end bigger than the opening solve that problem? Also, I was thinking that some people might like that shape better than what is currently available.
The only down side I can think of to having cups shaped like that is it might be hard to get out of them if the mouth is more narrow, but that could be fixed by applying positive pressure to blow them back out like popping a cork. XD
It's just an idea. If there were extra large cups that had large or medium openings at the base I'd definitely give them a try.