Does it job very well and is flexible enough to withstand offroad trails as well as the ocassional case. The thing I hate the most about this is the way it locks! It's so easy to have it taken off did it's almost prone to getting stolen or even fall off if it gets caught in a branch. It so very oft moves from one side to the other (does not stay centered on the wheel), but not while riding though. I had to use a zip lock to secure it in place so I would've preffered CLEARLY something with a hex-key lock to be honest. But from a muddy point of view it definitely does the job, no more mud spray on my jersey and backpack.
