Jasong,

I have a travel agent on my Raleigh Twenty's rear V-brake so that I can get more stopping power with my Sora Brifters. It works like a charm. I don't get quite as much stopping power on my Twenty compared to my Road bike (with road brakes), but it's much better than it was, and I trust the brakes on downhills. I didn't need one on my front brakes, for whatever reason,

Juan