I know we all have different experiences, and I must relate my own experience, having ridden thousands of miles on both "S" model and non-S.
The rails on the S model are about 1.5" shorter than the rails on the non S. Thus, if you position your saddle all the way back on its rails, the back edge of the S model was always more forward on the bike than my non-S model. For me, this put my center of gravity way too far forward and i had too much weight falling forward onto my hands. Just my own experience of course.
Just as an interesting visual comparison of the "S" vs. the non-S Brooks saddles...
Here is my Rivendell Rambouillet with its original B17S saddle when I first got the bike:
And here is the same bike a couple years later with a B68 (not an "S" model), same seatpost:
Note also how I initially had my saddle set pretty low when i first got my bike. It seemed so scary tall! lol!







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