That was the first thing I changed on the TT bike I bought. For some reason even though it was a dedicated TT bike the person who owned it before me had it set up with brifters on the cowhorns. It made little sense to me to do it that way since in order to shift you had to get out of the aero position. Mine are set up to be indexed for the back and friction for the front. It took a little practice to remember which way to go to shift them, but when it came to the first race I didn't have any goofs. I don't know if it made a difference in my time or not but it was much more comfortable to not have to get out of the drops repeatedly. If you didn't get a pair of aero brake levers to replace the brifters for braking you may want to make those your next purchase. You can get them pretty cheap and they're a lot more hand friendly than mounting brifters out on the bars.



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. I'm not sure how much time this has actually saved me, but I feel faster
And I still think that for me, it likely made a 10 - 15 second difference.