Kinda a slight tangent from this discussion:
My experience with football boots (that's soccer for the US crowd) is that once they're on and tied properly, I never have to adjust them for an entire game - 90 minutes worth of interval sprinting on grass, lots more foot movement than a cycling shoe may ever see. But, on the other hand, like other people here I've found myself adjusting shoes both at the beginning of a ride and also later on in the day (especially if it was a long, tough day) to loosen them up a little bit. So some adjustability might be needed on the bike? :shrug:
But back to that tangent.
Giro empires -> shoe lacing, stiff shoes, light, and MSRP of $275 US (which isn't that bad, actually)
But, meanwhile there's this, which is very tempting: viewtopic.php?f=3&t=113006
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Adidas F50's with lacing that isn't directly on the center of the metatarsal + mod/carbon -> shoe lacing, stiff sole, form-fitting comfort, custom, light, MSRP of way less...
What I was sort of mentioning earlier (the "Tejin" upper on the Prolights and the Empires) comes from football boots. I don't think it's a panacea, but they say that it should mold (stretch) to your foot after a few rides. YMMV, but my Prolights (after... I think 1400 miles, basically since Christmas) feel fantastic and I never adjust them. I suspect the Empires will be the same way.
That's what they said about Kangaroo leather too, though (Copa Mundials were always my boots of choice) and I had some Fizik R1s that never quite fit right (constantly adjusted them).