Anyone who can ride a Brooks saddle earns the nickname "iron bottom" in my book. My road bike has a Sella Turbo, which is hard enough.

I think AZ's description is right on-when I lean into a corner, I have my outside leg down and against the saddle; I can feel what the bike is doing. If it starts to hop around a bit, which is bad enough, I can at least feel what it is doing. I'm not adventurous enough to try one of these new designs because what I have works pretty well.
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Don't get me started, you know how I get.