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I work in carbon fiber.  It's light, strong, and maintains a stiffness based on thickness that if tweaked juuuust right, provides a spring of energy return at the moment the proximal tibia advances over the toes.  It's not toe-off  i'm concerned with, it's the assistance of the body's COG to get forward.  By the time the heel is off the gound is too late.  But if I can help the heel to rise from the return of energy stored by pronation in the mid-foot, my mission has been accomplished.
Guess what, I do and it is.  Try any of these styles and experience what comfort really is.