I think that often times working memory doesn't have the wow factor. It makes academics and even tasks of daily living a breeze, but doesn't enable those flashes of brilliance that we associate with genius or lesser giftedness.

I have given the matter some thought and am actually in the camp that values working memory and thinks that it is as valid a measure of giftedness as perceptual reasoning and verbal comprehension. However, I have to say that I was surprised that DD's working memory abililities were higher than those of DS just because he is my more advanced child; but on reflection, it did make sense as everything is always so easy for DD. Of course, I am comparing high versus very high and there may be a threshold beyond average where it's not an issue.