One of the most important components
The front derailleur has a difficult job, but when it is working properly it is easy to forget it's even part of the bike. However, a poorly functioning front mech is the fastest way to ruin a good ride. Fortunately, I have had the pleasure to be the owner of a 105 front derailleur, which has made me a very happy cyclist. I only had to adjust it once over three years (cable change), and it never gave me any trouble. Perfect, quick shifts every time. No dropped chains. Shimano knows what they are doing! Price to performance ratio, 105 FD5700 is the clear winner.