These work great if you don't wear a tie, but if have to wear a tie, then you have to basically put the stays in, tie the tie and leave some buttons unbuttoned, then go in through the open buttons to put the magnets in.  Maybe I'm being totally stupid, but I can't think of another way to do this with a tie.  Also, not worth $40- a bit too pricey for how easy it is to lose the magnets, how easily the stays slip out of collars when the collar is up, and how thin they are.  The best collar stays are wide and keep the collar stiff.

Even with all these complaints I still gave it 4 stars so that should tell you something.