Originally Posted by
desconhecido
Supposedly, the Stronglight A9 headset is less susceptible to "indexed" steering than ball bearing headsets. Ben's has what appears to be the "traditional" A9 headset ($50) with roller bearings but only in black.
I seem to recall that Brandt doesn't like the A9 headset. You might consider that, if you care what Brandt thinks about headsets.
I had an A9 with what I think was an aluminum cups. They got indexed. I had a Stronglight O'Light threadless unit with the same roller bearing setup and it would never stay in adjustment. I've had better experience with Tange Levin units, replacing the caged bearings with loose balls.
Being open to the possibility the A9 problems were user error, it seems the Levin is more forgiving.