Shimano 105 Triple Front Derailleur 5603. The wide pivot link design boosts strength and rigidity. Flex is suppressed, creating sharp, precise shifts that are faster and smoother, even from low to high gears off of the saddle.
Better than even cheaper deraillers
Weaknesses: Not durable
Wont shift under pressure
This derailer is completely garbage. It came stock on my Giant OCR 1 and completely snapped off (broke) within 1 year of heavy riding. I now have a new Specialized Allez Comp that comes stock with it, it has not broken yet but the shifting is not the best. With the slightest tension on the chain you cannot shift into the smallest chainring. I have a 1 year old Ultegra derailler on my giant now and it shifts beautifully, under all conditions. Get Ultegra or Dura-ace. I plan on swapping on my specialized soon.