For the really low price and incredible ease of installation, this fender is definitely something to keep around as a backup, for a friend, or for setups that don't permit full fenders.
I use mine regularly, and if I plan to leave it parked outside for a long time, it's easy to take inside with me so it doesn't get stolen.
Nice economical bike fender. Works well during thunderstorms you can't beat the price on this product granted for optimal protection one should get full fenders but for those where that is not an option this is your best bet. You do have to tighten the bolt so that the fender does not fall when you are riding.