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drop your entire bike fit (seatpost/handlebar stack) by 8mm
But it's not an 8mm drop, it's 8mm stack from the axis to the sole of your shoe. If you were already obsessed with low pedal stack you'd be using 4-bolt Speedplay, which are 8.5mm from axis to shoe sole. It's a lot of fuss over 0.5mm 🙂
gbj_tester-
Of course, my laziness. I do remember an Alex Dowsett video where he suggested part of his allegiance for Bont shoes was the low stack height of the shoe (eg thickness from cleat to sole of foot) giving an aero benefit for just such a fit change and this a similar key benefit of the Adam Hansen home made ones.
Perhaps with the trend for having tufts of hair protruding through you aero helmet those 0.5mm have become of increased significance.
sidewinder
I would guess some/all of the theoretical watts saved is that 8mm lower stack allows you to drop your entire bike fit (seatpost/handlebar stack) by 8mm with associated aerodynamic benefits.