At first I found the flip-flop hub to be a neat little idea. Now that I have one I realize that I have never had the urge to suddenly change my gearing while riding.. I could possibly use a fixed/fixed one like the Surly, but switching over to a freewheel is practically blasphemy. And the truth is, if I am tired out, I actually like being fixed more as it keeps my legs moving, which keeps the muscles from tightening up and cramping.. What do you guys think??