I have about 12000 miles or so on two different Sora bikes. No probs with it. The thumb shifters are nice. I can grab them from the drops if I move my hands up and stretch my thumbs out. The front derailleur snapped right at the tab which holds the spring. That kind of pissed me off. Now I have a 105 double on my triple. It took some fiddling to get it just right but I can't tell the difference.