I can say this one is inconsistent with the spacing of fixed vs. adjustable. I really do prefer to space any shelving fixed or otherwise with equal dimension between the shelf panels. I know the dimension of the shelf or pullout...what I need is to have however many shelves I call for spaced evenly from top to bottom. There is the occasional time that I would prefer to have unequal spacing but that is rare. Equal spacing is always the preferred method.
As a cabinet maker we provide consistent spacing (cutmaster settings) with the pin holes for the end user to make adjustment to their desire. However in graphic presentation equal spacing looks better.