I've seen and used many different types of capos over the years and they range from the very cumbersome and difficult to use to the easily breakable but I've never used one as convenient and as well constructed as this Kyser one.  It is by far the best I've ever seen and I've been using it for years now and it still works fine.  It makes moving the capo quickly a cinch and the gold doesn't corrode or tarnish making it look like new even after all these years.