The lever on the back has a gap in it because the cables have to be able to pass through it when it opens. I'm not trying to do a Kam tail. It would be better if I didn't need that gap, but the air is basically converged by then so I don't think it is too detrimental.
The bont shoe has 2 major issues, maybe 3. Most of the time- especially if you are on a TT bike- you are in a toe down position other than at the bottom of the pedal stroke. So the shape of the sole is really important as it is the trailing edge. They have shaped the sole, but they used the wrong shape. I'm on my cell phone so I can't draw a picture easily but it will not do a great job at reducing turbulence and low pressure behind the shoe.
The second major issue is that they extended the toe into a pointy shape, like a jet fighter. When the shoe is level this is probably beneficial but when it's in a toe down position it's extra frontal area that is very poorly shaped.
I think their heel shape is bad too but I'm not ready to elaborate.
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Ed O'Malley
www.VeloVetta.com Founder of VeloVetta Cycling Shoes
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