I would guess that the single biggest ergonomical win comes from a split keyboard, where the hands are no longer angled outward. Any other feature (staggering,

I would guess that the single biggest ergonomical win comes from a split keyboard, where the hands are no longer angled outward. Any other feature (staggering, thumb keys, bowled wells etc) would give further, but much smaller, improvements. At least this is me experience after 4-5yrs of Kinesis Advantage.