Originally Posted by
Looigi
This is by far the main thing. After this, there may be subtleties that are more important/noticeable so some, like how much movement the shoe has with respect to the pedal in various directions.
Agree. I have SPD's and just got my new custom D2 cycling shoes. The only reason I got custom is the fact that I have one leg 3/4" shorter than the other, so the manufacturer added the 3/4" to the sole (well between the shoe and the sole plate). I was out yesterday riding in the wind, uphill, and actually gaining speed from pulling on the upstroke. So for me, going uphill, in the wind shifting up, and a comfortable, proper fitting tight shoe made for an awesome ride!
To me, having an extremely stiff sole coupled with whatever attachment system is a winner-no matter who makes the attachment.