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The main thing about them is the big ass springs.
I had on of these leppers on a american bike i built - pic related - these leppers with springs are really comfy, you won't feel the bump on the road.
On the other side, you can't help with your saddle to give power to the pedal like on a roadbike.
But they are great saddle for cruisin', search second hand ones they go sometimes fairly cheap.