I was thinking about this product for some time now. Since I really like the idea, I gave it a try. Well, what a waste of money for me...
I have D cups, and those things looked funny when I attached them to the bra. They were not laying flat if it make sense. When I put a shirt on, I can see where the material of each camisole ends. And I am sure people around me can see it too - looks weird and silly. If you manage to put the ends of camisoles inside the bra, you better sit still and never band over/try to pick something up from the floor because everyone will see your "secret".

This product was my last investment in "as seen on TV" crap.