They work, but.... tricky to get your bra on.  One reviewer wrote you clip it on your straps, then put it on over your head.  This does work, but sometimes it takes me four attempts, when I raise the bra up, sometimes one clip slips off and then you have to start all over again.  A little frustrating!  But once on, they really work and I am happy I am not annoyed by constantly pulling up my straps.