I've worn out multiple of them over many many years of using the Kinesis Advantage (and then Advantage 2) (before I went down the splergo rabbit hole).
One thing to note is that people with large hands and/or long finger lengths can find the fixed size hand wells too cramped.
One thing to note is that people with large hands and/or long finger lengths can find the fixed size hand wells too cramped.
Another thing to note is that they are loud.