Now that all the gear (mostly) is onto the SA rack... I have to admit there is indeed a positive change in system performance, bass impact & resolution, and inaging were the more noteable improvements.
Wood does have it's merits too, as the addition of wood shelves has added a touch of warmth and naturalness simply by placing one here and there, onto the existing SA shelving. having some cut to fit and replace the nylon supplied shelves will I bet, add still more to the overall performance.