Jeff Starr wrote:

Maybe weight and snob appeal are the main differences?
Of course, that would be it. My desire to be a snob drove me to buy
the Dura-ace components. Never mind that most people don't know, care,
or can tell the difference.
The D-A STI's don't rattle. An important feature ifd you live in a country
with roads made of bricks and/or cobble stones.

Gr, Derk