My Prodisc adr's in my neck are clicking and it drives me up the wall sometimes. On freeways with xpansion joints it goes clicketyclicketyclickety... holding head slightly forward reduces the amount of click. I have been told that as long as no one on the "outside" can hear it then it is normal.
My Active-L is silent.
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Nov 07: STALIF Fusion L5/S1 ACTIV-L ADR L4/L5
Nov 09: Prodisc-C ADR 2 level C 4/5/6
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