Interesting comment by the LBS tech during a recent visit. He mentioned that they don't see setback seat posts much these days because it changes the pedal stroke. Tech also said that the saddle should ideally be in the "middle", meaning the clamp should be more center on the saddle rail. i wouldn't be able to tell the difference in pedal strokes. My setback Thomson feels good but the saddle is pushed to nearly the back end of the rails.

Does it really matter?