5 8 5 wrote:
That's more a case of the chain catcher being incorrectly setup. It may be easy to get the chain back on but it still takes time. The OP made the point he lost touch with the group he was in. It's the reason most Pro bikes have them fitted.
Also there's the damage to a frame's finish from a chain drop - gouges in carbon, scratched paint etc.
Here's the problem with chain catchers.......when set up correctly, if you get chain suck or you accidentally pedal backwards after a shift (this sometimes happens when you have just shifted down before a stop, and the chain is part way shifted, then you pedal slightly back), you will get the chain stuck under a perfectly setup chain catcher. You're screwed at that point unless you get the catcher out of the way, by loosening it, or maybe bending it. I agree that you prevent damage due to chain drop, but with a well setup FD, chain drop is a rare occurence, and unless you keep pedaling hard after a drop, the damage is minor if at all, in an area that's beefy and hard to really wreck. I understand many use and love catchers, I'm just providing an alternative view, without wanting to get into a big OT debate on catchers.
ps. Andy Schleck had a chain catcher..............and you know what happened there.