Well . . . . I'm getting ready to take the SL-K off my Spectrum and get another Kestrel Pro which I have on my Kelly Bonestock. I'm not sure if it is the modulus of the carbon or the different forks on the bikes, but my hands go numb on the FSA SL-K. I'm not super thrilled about that flat section because it is tilted back a bit too much placing my wrists too low. I also think the reach from the drops to the Campy brake levers is shorter on the Kestrel, a classic round bar.