The other thing that happens with capos is that the rubber or plastic on the capo gets dented iniby the strings if you always place it in exactly the same place. I find a Keyser best, and sometimes put it the other way round, which spreads the load, so to speak.

The really handy thing with a Keyser is that yoiu can move it around to different frets in the middle of a set -say if too many guitars join in and you want to move up and be playing where the sound isn't so crowded.