For the percussionist who cares about the sound, these things are a must. I would use them for live performance ocasionally, but mostly for studio/rehearsal. Their cost and flexibility make them an essential component of the drummer who can hear and tell the difference. Otherwise dont bother, as they don't store that well -you have to leave them flat, untattered, and unbent, otherwise you have problems. I have several sets for each kit I use, and always have spares around.