Originally Posted by
escarpment
Look, a brifter is a brifter, some are very expensive and work better then others, but they all shift gears. The Sora and 2300 have thumb shifters instead of the paddles under the break levers. But its not going to make you any less "aero" or slower.
I have never heard anyone bring up that argument. As others have stated, the thumb shifter is incredibly difficult to use when in the drops. I recently upgraded from a flat bar "road" bike to an actual road bike and the one thing I was completely against buying was thumb shifters because I didnt like that when test riding. Im glad I did too because I often find myself in my drops needing to shift.