I have rapid fire shifters on my Jamis and I had them on my Trek as well. They are better on the Jamis because of the XT derailleur. Sometimes you can't even hear them shift. They are really crisp and clean and fast. While test riding the Cannondale, I really noticed the sound of the shifters. I couldn't believe how much they clunked and I thought it may have been the DX derailleur. When I brought the bike back and told the shop person, he said that's the nature of STI shifters. I didn't have any problem with the trim mood on the front, but that back made more racket than I'm used to hearing. Is that the case, with those kind of shifters. If so, other than the rapid fire shifters, which would be smoother? I'm thinking barend shifters, but don't know for sure.