I had a rear Ultegra brifter (2003 model) break in the first 1000 miles. The pawl refused to engage in downshifts. My LBS replaced it under warranty.
I also had a rear Campy Daytona (1999, now Centaur) brifter quit after about 20,000 miles and had to be rebuilt. It would bind up when trying to downshift and finally locked up necessitating a trip to the LBS.
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“Train hard until your legs are tanned, then keep going until the shape arrives.” -Jolanda Neff