Nope. Nada. Never. Smooth as a baby's butt until the lifetime warranty expires.
Seriously, they are wonderful, and they don't wear out. If, somehow, something breaks they really are guaranteed for life.:happydance:
Now that you have these for reference, the Options from Knitpicks are just as slick and smooth, with a cord that's just as plyable. The tips are a bit pointier, which has come in handy at times.
I'm a diehard Addi fan, but Options really do rival them.