I did a 12 mile descent up in Vermont (credit card tour) with stretches of about 10%. I had to do the front to back feathering as the road was rough, curvy and some construction trucks would appear from time to time. It worked fine for me in that I was always in control and the brakes/rims never got very hot. But that night, my wrists were pretty tired, feeling almost like I had carpal tunnel. In retrospect, I'd do it again the same way. It worked.