Serfas Road Pad Cartridges
 

Has anyone ever tried these Serfas BP110 Shimano road replacement brake pads? My local REI sells them for cheap--$5.00/set. I always see them there and wonder whether they are any good or whether you just get what you pay for, which isn't much. I know Dura Ace pads and Kool Stop pads work well, but just wonder if these Serfas pads work pretty well too.

http://www.rei.com/product/752080