I'll put mine on and off throughout the year - but they are very welcome for a 200,300,400, and 600k (and up) ride. If its going to rain all day, and I'm going to be out there, I want my fenders on. They add a little weight, but a comfortable cyclist is one that can keep riding. They also keep tons of crap off the drivetrain, bottom bracket, and with a mudflap - out of your shoes.

Honjo's are my favorite.
I've tried Planet Bike, RaceBlades, and Headlands. The Honjo's I have on the IF are the finest thus far. Need to add a mudflap for brevet season - but I've had them on the bike since October and love them. This bike is Jeckyll / Hyde - it goes back and forth from my distance machine to my more standard road machine... fenders are just one more tool to have to enjoy cycling in all weather.

These are the narrow - and they fit well under the Shimano long reach brakes I used on this build:






They even keep me dry indoors:








If you need to mount fenders on your tight clearance road bike, try these: (apologies if these have been mentioned previously):