I use these Kyser capo's all the time; I would rate them 5 star, except the spring on them will eventually break, thus you need to get a new one to replace it.  I have replaced at least three of these in the last ten years or so - yes, I do play four separate guitars, thus the high count, BUT, if the spring was higher quality, they would last forever!  Still, this is my "GO TO"  capo!