Theoretically, these seem like a great idea.  Their construction seems good, and I imagine that if they fit properly, they would work.  However, they run VERY small.  Because cup sizes increase proportionately with band size (the cup of a 38D is much bigger than a 32D), I knew I was taking a gamble on these.  For reference, these cups are about the equivalent of a 32D.  So, for ladies who wear a larger band size, know that these will end up being small.

I have experimented with these on several occasions, with different placement, and they are simply too small to do any good.  I won't be wearing them again.  They do make bigger sizes which you can order directly from Nubra.  I recommend spending the extra money if you are concerned about fit.