I have several Kyser capos because I seem to have a bad habit of losing them at jam sessions.  Perhaps I loan them out too much... Anyway, they are great.  What I particularly love is that I can park the capo on the head of my guitar (next to the tuner) when I don't need it and quickly grab it and put it on without much fuss.  The capo grips well, applies quickly anywhere on the neck, and I can use it on a variety of guitars as well as other instruments.  It even grips well on the first fret where other capos can sometimes buzz.