I really like the concept of these, however, they do have a few flaws.  First of all, they aren't quite long or wide enough.  I find I have to safety pin them to my bra to keep them from riding up and because they are tapered they don't always cover my bra when wearing wide necked tops or blouses.  The overall idea of these is great, and they have worked in covering too much cleavage but it would be nice to not have to pin them in order for them to stay put.