Work great but.....
Awesome idea but a little flawed in design.  Played yesterday for first time with them on some Sketchers I bought.  Lost 3 spikes during the round, all of them from the left foot toe position (I'm right handed).  The spikes are screwed in clockwise.  When you make your swing and weight shift to the left, your left toe is moving a little counter-clockwise.  This apparently "unscrews" that spike.  The only cure is glue them in place.  While that is fine, my original plan was to switch them between shoes on occasion.
Rating: 4 stars