Concave-well keyboards like the Kinesis Advantage curl fingers along their natural arc to prevent strain

Standard split keyboards (like the Microsoft Natural) reduce some risk but do not prevent RSI. High-end keyboards like the Kinesis Advantage place keys in concave bowls so fingers curl along their natural arc to hit keys, with no twisting or stretching and minimal movement. Frequently used non-character keys are handled by the thumbs. The author reports the re-learning curve is about two days, after which wrist and finger pain are gone, calling it the best investment he has made for avoiding far more expensive drugs or surgery.

Examples

In the Kinesis Advantage, the palm rests inside a concave bowl and fingers curl to reach keys; the author found Microsoft Natural keyboards ‘amateurish in comparison’ and unable to prevent RSI.

Assessment

Compare the ergonomic advantages of the Kinesis Advantage over standard split keyboards. Which design difference most directly addresses RSI, and why does it matter for a live coder?