I use very simple to use SKS Bluemels, I love the way they can quickly be put back into proper position with the quick release sliding thing they use, I had a set of Planet Bike Cassidas on the touring bike that got crunched and those things was a pain in the arse to keep adjusted correctly, and they made a lot of noise, the Blumels you almost forget they're on the bike. But the sliding adjustable rails also prevents stuff like sticks getting wedged in between the tire and the fender and then either breaking the fender or in some rare instances locking up the wheel, instead the rails on the Bluemels are suppose to just slide preventing the lockup...supposedly.